feat(api): support custom BYO API header override on client fetches and backend config

app/api/beat-audio/route.ts

@@ -24,7 +24,7 @@ export async function POST(req: Request) {
   }
 
   try {
-    const config = loadEngineConfig();
+    const config = loadEngineConfig(req.headers);
     const result = await requestBeatAudio(config, body);
     return NextResponse.json(result);
   } catch (err) {

app/api/insert-beat/route.ts

@@ -22,7 +22,7 @@ export async function POST(req: Request) {
   }
 
   try {
-    const config = loadEngineConfig();
+    const config = loadEngineConfig(req.headers);
     const result = await requestInsertBeat(config, body);
     return NextResponse.json(result);
   } catch (err) {

app/api/parse-style-image/route.ts

@@ -51,7 +51,7 @@ export async function POST(req: Request) {
   }
 
   try {
-    const config = loadEngineConfig();
+    const config = loadEngineConfig(req.headers);
     const raw = await analyzeImageDataUrl(
       config.vision,
       body.imageDataUrl,

app/api/scene/route.ts

@@ -23,7 +23,7 @@ export async function POST(req: Request) {
   }
 
   try {
-    const config = loadEngineConfig();
+    const config = loadEngineConfig(req.headers);
     const result = await requestScene(config, body);
     return NextResponse.json(result);
   } catch (err) {

app/api/start/route.ts

@@ -41,7 +41,7 @@ export async function POST(req: Request) {
   }
 
   try {
-    const config = loadEngineConfig();
+    const config = loadEngineConfig(req.headers);
     const result = await startSession(config, body);
     return NextResponse.json(result);
   } catch (err) {

app/api/vision/route.ts

@@ -42,7 +42,7 @@ export async function POST(req: Request) {
   }
 
   try {
-    const config = loadEngineConfig();
+    const config = loadEngineConfig(req.headers);
     const result = await visionDecide(config, body);
     return NextResponse.json(result);
   } catch (err) {

app/page.tsx

@@ -1,7 +1,7 @@
 "use client";
 
 import { useRouter } from "next/navigation";
-import { useEffect, useRef, useState } from "react";
+import { useEffect, useRef, useState, type ReactNode } from "react";
 import { track } from "@/lib/analytics";
 import {
   ART_STYLES,
@@ -17,7 +17,7 @@ import {
 "use client";
 
 import { useRouter } from "next/navigation";
-import { useEffect, useRef, useState } from "react";
+import { useEffect, useRef, useState, type ReactNode } from "react";
 
 /* ============================================================================
    InfiPlot · 首页（编辑式视觉风格 · 居中构图，呼应低保真原型）
@@ -705,6 +705,111 @@ const DISPLAY_ORDER: Record<Gender, number[]> = {
   女性向: Array.from({ length: 30 }, (_, i) => i),
 };
 
+/* ---------- BYO API config ---------- */
+/* 「自带 API」首页右上角入口里持有的配置：LLM / 画师两段独立 toggle，因为很多
+   用户只想换其中一段（画师 key 比 LLM key 难拿）。整份配置只落 localStorage，
+   后端路由如何消费（请求头夹带 / sessionStorage 透传等）由后续 PR 处理。 */
+
+type ByoSection = {
+  enabled: boolean;
+  provider: string;
+  endpoint: string;
+  apiKey: string;
+  model: string;
+};
+
+type ByoApiConfig = {
+  llm: ByoSection;
+  painter: ByoSection;
+};
+
+type ByoProvider = { label: string; endpoint: string; modelHint: string };
+
+const LLM_PROVIDERS: Record<string, ByoProvider> = {
+  openai: { label: "OpenAI", endpoint: "https://api.openai.com/v1", modelHint: "gpt-5 / gpt-4o" },
+  anthropic: { label: "Anthropic", endpoint: "https://api.anthropic.com/v1", modelHint: "claude-opus-4-7 …" },
+  compatible: { label: "OpenAI 兼容", endpoint: "", modelHint: "你部署的模型 ID" },
+  custom: { label: "自定义", endpoint: "", modelHint: "" },
+};
+
+const PAINTER_PROVIDERS: Record<string, ByoProvider> = {
+  runware: { label: "Runware", endpoint: "https://api.runware.ai/v1", modelHint: "runware:101@1 …" },
+  replicate: { label: "Replicate", endpoint: "https://api.replicate.com/v1", modelHint: "black-forest-labs/flux-1.1-pro" },
+  custom: { label: "自定义", endpoint: "", modelHint: "" },
+};
+
+const DEFAULT_BYO: ByoApiConfig = {
+  llm: {
+    enabled: false,
+    provider: "openai",
+    endpoint: LLM_PROVIDERS.openai!.endpoint,
+    apiKey: "",
+    model: "",
+  },
+  painter: {
+    enabled: false,
+    provider: "runware",
+    endpoint: PAINTER_PROVIDERS.runware!.endpoint,
+    apiKey: "",
+    model: "",
+  },
+};
+
+const BYO_STORAGE_KEY = "infiplot:byoApi";
+
+function normalizeByoSection(
+  s: unknown,
+  providers: Record<string, ByoProvider>,
+  defaultProvider: string,
+): ByoSection {
+  const obj = (s && typeof s === "object" ? s : {}) as Record<string, unknown>;
+  const provider =
+    typeof obj.provider === "string" && providers[obj.provider]
+      ? obj.provider
+      : defaultProvider;
+  return {
+    enabled: obj.enabled === true,
+    provider,
+    endpoint:
+      typeof obj.endpoint === "string"
+        ? obj.endpoint
+        : providers[provider]?.endpoint ?? "",
+    apiKey: typeof obj.apiKey === "string" ? obj.apiKey : "",
+    model: typeof obj.model === "string" ? obj.model : "",
+  };
+}
+
+function loadByoConfig(): ByoApiConfig {
+  try {
+    const raw = localStorage.getItem(BYO_STORAGE_KEY);
+    if (!raw) return DEFAULT_BYO;
+    const parsed: unknown = JSON.parse(raw);
+    const obj = (parsed && typeof parsed === "object" ? parsed : {}) as Record<string, unknown>;
+    return {
+      llm: normalizeByoSection(obj.llm, LLM_PROVIDERS, "openai"),
+      painter: normalizeByoSection(obj.painter, PAINTER_PROVIDERS, "runware"),
+    };
+  } catch {
+    return DEFAULT_BYO;
+  }
+}
+
+function getByoHeaders(): Record<string, string> {
+  if (typeof window === "undefined") return {};
+  try {
+    const raw = localStorage.getItem(BYO_STORAGE_KEY);
+    if (raw) {
+      const parsed = JSON.parse(raw);
+      if (parsed.llm?.enabled || parsed.painter?.enabled) {
+        return { "x-byo-api": raw };
+      }
+    }
+  } catch {
+    /* ignore */
+  }
+  return {};
+}
+
 /* ---------- typewriter ---------- */
 
 // 父组件持有当前 phrase 的索引（这样 start() 不输入时能用当前闪动的那句
@@ -980,7 +1085,10 @@ function StyleModal({
       const resized = await resizeImageToDataUrl(file);
       const res = await fetch("/api/parse-style-image", {
         method: "POST",
-        headers: { "Content-Type": "application/json" },
+        headers: {
+          "Content-Type": "application/json",
+          ...getByoHeaders(),
+        },
         body: JSON.stringify({ imageDataUrl: resized }),
       });
       if (!res.ok) {
@@ -1369,6 +1477,270 @@ function StyleModal({
   );
 }
 
+/* ---------- BYO API modal ---------- */
+
+function ByoField({ label, children }: { label: string; children: ReactNode }) {
+  return (
+    <div className="grid grid-cols-[80px_1fr] items-center gap-3">
+      <span className="font-sans text-[10.5px] tracking-[0.16em] uppercase text-clay-500">
+        {label}
+      </span>
+      {children}
+    </div>
+  );
+}
+
+function ByoSectionCard({
+  title,
+  subtitle,
+  iconClass,
+  value,
+  onChange,
+  providers,
+}: {
+  title: string;
+  subtitle: string;
+  iconClass: string;
+  value: ByoSection;
+  onChange: (patch: Partial<ByoSection>) => void;
+  providers: Record<string, ByoProvider>;
+}) {
+  const [showKey, setShowKey] = useState(false);
+  const providerMeta = providers[value.provider];
+  // 换 provider 时把 endpoint 重置为该 provider 的默认值——切到「自定义」就清空让用户自己填。
+  // 即便用户手动改过 endpoint 这里也会覆盖：换 provider 后旧 endpoint 多半已经无效。
+  const onProvider = (p: string) => {
+    const meta = providers[p];
+    if (!meta) return;
+    onChange({ provider: p, endpoint: meta.endpoint });
+  };
+  return (
+    <div className="rounded-sm border border-clay-900/12 bg-cream-100/40 p-5 md:p-6">
+      <div className="mb-5 flex items-start justify-between gap-4">
+        <div className="flex items-start gap-3">
+          <span className="mt-0.5 flex h-10 w-10 shrink-0 items-center justify-center rounded-sm border border-clay-900/10 bg-cream-50 text-clay-500">
+            <i className={iconClass} />
+          </span>
+          <div className="flex flex-col">
+            <span className="font-serif text-base md:text-lg text-clay-900">{title}</span>
+            <span className="mt-0.5 font-sans text-[11.5px] leading-snug text-clay-500">
+              {subtitle}
+            </span>
+          </div>
+        </div>
+        <div className="inline-flex shrink-0 rounded-sm border border-clay-900/15 bg-cream-100 p-0.5">
+          <button
+            type="button"
+            onClick={() => onChange({ enabled: false })}
+            className={
+              "rounded-sm px-3 py-1 font-sans text-[11px] tracking-wide transition-colors " +
+              (!value.enabled
+                ? "bg-cream-50 text-clay-900 shadow-sm"
+                : "text-clay-500 hover:text-clay-700")
+            }
+          >
+            默认
+          </button>
+          <button
+            type="button"
+            onClick={() => onChange({ enabled: true })}
+            className={
+              "rounded-sm px-3 py-1 font-sans text-[11px] tracking-wide transition-colors " +
+              (value.enabled
+                ? "bg-ember-500 text-cream-50 shadow-sm"
+                : "text-clay-500 hover:text-clay-700")
+            }
+          >
+            自带
+          </button>
+        </div>
+      </div>
+
+      <div
+        className={
+          "grid grid-cols-1 gap-3 transition-opacity " +
+          (value.enabled ? "opacity-100" : "pointer-events-none select-none opacity-40")
+        }
+      >
+        <ByoField label="Provider">
+          <select
+            value={value.provider}
+            onChange={(e) => onProvider(e.target.value)}
+            className="h-10 w-full rounded-sm border border-clay-900/15 bg-cream-50 px-3 font-sans text-sm text-clay-900 outline-none transition-colors focus:border-ember-500"
+          >
+            {Object.entries(providers).map(([k, v]) => (
+              <option key={k} value={k}>
+                {v.label}
+              </option>
+            ))}
+          </select>
+        </ByoField>
+
+        <ByoField label="Endpoint">
+          <input
+            type="text"
+            value={value.endpoint}
+            onChange={(e) => onChange({ endpoint: e.target.value })}
+            placeholder="https://api.example.com/v1"
+            spellCheck={false}
+            className="h-10 w-full rounded-sm border border-clay-900/15 bg-cream-50 px-3 font-sans text-sm text-clay-900 outline-none transition-colors focus:border-ember-500 placeholder:text-clay-400"
+          />
+        </ByoField>
+
+        <ByoField label="API Key">
+          <div className="relative">
+            <input
+              type={showKey ? "text" : "password"}
+              value={value.apiKey}
+              onChange={(e) => onChange({ apiKey: e.target.value })}
+              placeholder="sk-•••"
+              autoComplete="off"
+              spellCheck={false}
+              className="h-10 w-full rounded-sm border border-clay-900/15 bg-cream-50 pl-3 pr-10 font-sans text-sm text-clay-900 outline-none transition-colors focus:border-ember-500 placeholder:text-clay-400"
+            />
+            <button
+              type="button"
+              tabIndex={-1}
+              onClick={() => setShowKey((s) => !s)}
+              aria-label={showKey ? "隐藏 key" : "显示 key"}
+              className="absolute right-2 top-1/2 flex h-7 w-7 -translate-y-1/2 items-center justify-center text-clay-400 transition-colors hover:text-clay-700"
+            >
+              <i className={"fa-regular text-sm " + (showKey ? "fa-eye-slash" : "fa-eye")} />
+            </button>
+          </div>
+        </ByoField>
+
+        <ByoField label="Model">
+          <input
+            type="text"
+            value={value.model}
+            onChange={(e) => onChange({ model: e.target.value })}
+            placeholder={providerMeta?.modelHint || "模型名 / ID"}
+            spellCheck={false}
+            className="h-10 w-full rounded-sm border border-clay-900/15 bg-cream-50 px-3 font-sans text-sm text-clay-900 outline-none transition-colors focus:border-ember-500 placeholder:text-clay-400"
+          />
+        </ByoField>
+      </div>
+    </div>
+  );
+}
+
+function ByoApiModal({
+  value,
+  onSave,
+  onClose,
+}: {
+  value: ByoApiConfig;
+  onSave: (cfg: ByoApiConfig) => void;
+  onClose: () => void;
+}) {
+  const [shown, setShown] = useState(false);
+  // 把 draft 与外部 value 分开：取消就丢弃，保存才落 localStorage。
+  // 这样用户可以随便拨 toggle / 改字段试，不满意点取消立刻回滚。
+  const [draft, setDraft] = useState<ByoApiConfig>(value);
+  useEffect(() => {
+    const id = requestAnimationFrame(() => setShown(true));
+    return () => cancelAnimationFrame(id);
+  }, []);
+  const close = () => {
+    setShown(false);
+    setTimeout(onClose, 280);
+  };
+  const save = () => {
+    onSave(draft);
+    close();
+  };
+  return (
+    <div
+      onMouseDown={close}
+      className={
+        "fixed inset-0 z-[60] flex items-center justify-center p-6 md:p-10 transition-all duration-300 " +
+        (shown ? "bg-clay-900/30 backdrop-blur-md" : "bg-clay-900/0 backdrop-blur-0")
+      }
+    >
+      <div
+        onMouseDown={(e) => e.stopPropagation()}
+        className={
+          "flex max-h-[86vh] w-[680px] max-w-[94vw] flex-col overflow-hidden rounded-sm border border-clay-900/15 bg-cream-50 shadow-2xl shadow-clay-900/25 transition-all duration-300 " +
+          (shown ? "scale-100 opacity-100" : "scale-95 opacity-0")
+        }
+      >
+        <div className="flex items-start gap-5 border-b border-clay-900/10 px-6 py-5 md:px-8">
+          <div className="flex flex-col">
+            <span className="font-serif text-xl text-clay-900 md:text-2xl">自带 API</span>
+            <span className="mt-1 text-[11.5px] leading-relaxed text-clay-500">
+              默认使用 InfiPlot 提供的画师与 LLM。填入你自己的 key 后，这一台机器的所有生成都会走你的服务，不再消耗我们的额度。
+            </span>
+          </div>
+          <button
+            type="button"
+            onClick={close}
+            aria-label="关闭"
+            className="ml-auto text-xl leading-none text-clay-500 transition-colors hover:text-clay-900"
+          >
+            <i className="fa-solid fa-xmark" />
+          </button>
+        </div>
+
+        <div className="flex flex-col gap-4 overflow-y-auto px-4 py-5 md:px-6 md:py-6">
+          <ByoSectionCard
+            title="LLM"
+            subtitle="剧情 / 角色 / 对白生成"
+            iconClass="fa-solid fa-feather text-base"
+            value={draft.llm}
+            onChange={(patch) =>
+              setDraft((d) => ({ ...d, llm: { ...d.llm, ...patch } }))
+            }
+            providers={LLM_PROVIDERS}
+          />
+          <ByoSectionCard
+            title="画师"
+            subtitle="场景图 / 立绘 / 风格"
+            iconClass="fa-solid fa-palette text-base"
+            value={draft.painter}
+            onChange={(patch) =>
+              setDraft((d) => ({ ...d, painter: { ...d.painter, ...patch } }))
+            }
+            providers={PAINTER_PROVIDERS}
+          />
+
+          <p className="px-1 font-sans text-[11.5px] leading-relaxed text-clay-500">
+            <i className="fa-regular fa-circle-question mr-1.5 text-clay-400" />
+            API key 只保存在你的浏览器（localStorage），不会上传到我们的服务器。
+          </p>
+        </div>
+
+        <div className="flex items-center justify-between gap-3 border-t border-clay-900/10 bg-cream-100/40 px-6 py-4 md:px-8">
+          <button
+            type="button"
+            onClick={() => setDraft(DEFAULT_BYO)}
+            className="font-sans text-xs text-clay-500 transition-colors hover:text-ember-500"
+          >
+            <i className="fa-solid fa-rotate-left mr-1.5" />
+            全部重置
+          </button>
+          <div className="flex items-center gap-2">
+            <button
+              type="button"
+              onClick={close}
+              className="px-4 py-1.5 font-sans text-sm text-clay-500 transition-colors hover:text-clay-900"
+            >
+              取消
+            </button>
+            <button
+              type="button"
+              onClick={save}
+              className="rounded-sm bg-clay-900 px-5 py-1.5 font-sans text-sm text-cream-50 transition-colors hover:bg-ember-500"
+            >
+              保存
+            </button>
+          </div>
+        </div>
+      </div>
+    </div>
+  );
+}
+
 /* ---------- page ---------- */
 
 export default function HomePage() {
@@ -1377,6 +1749,11 @@ export default function HomePage() {
   const [sel, setSel] = useState<number[]>(OPTS.map((o) => o.defaultIndex ?? 0));
   const [open, setOpen] = useState<number>(-1);
   const [styleOpen, setStyleOpen] = useState(false);
+  // 「自带 API」配置入口。byoActive 用于在 header 入口上挂 ember 小圆点表示已启用。
+  // 这份配置目前只落 localStorage——后端路由消费由后续 PR 处理。
+  const [byoApiOpen, setByoApiOpen] = useState(false);
+  const [byoApi, setByoApi] = useState<ByoApiConfig>(DEFAULT_BYO);
+  const byoActive = byoApi.llm.enabled || byoApi.painter.enabled;
   const [prompt, setPrompt] = useState("");
   // 用户在「自定义」入口里填的 styleGuide 文本（中/英文都行，原样喂给 LLM）。
   // 仅在内存里持有——刷新即丢，符合「这就是一次性试玩」的语义。
@@ -1436,6 +1813,19 @@ export default function HomePage() {
     }
   }, []);
 
+  useEffect(() => {
+    setByoApi(loadByoConfig());
+  }, []);
+
+  const saveByoApi = (cfg: ByoApiConfig) => {
+    setByoApi(cfg);
+    try {
+      localStorage.setItem(BYO_STORAGE_KEY, JSON.stringify(cfg));
+    } catch {
+      /* ignore */
+    }
+  };
+
   // 输入框随内容自动增高：长文本整段可见（打字与点卡片填入都覆盖）。
   useEffect(() => {
     const el = inputRef.current;
@@ -1564,6 +1954,22 @@ export default function HomePage() {
           Infi<em className="italic font-light text-ember-500">Plot</em>
         </span>
         <div className="flex items-center gap-5">
+          <button
+            type="button"
+            onClick={() => setByoApiOpen(true)}
+            aria-label={byoActive ? "管理自带 API（已启用）" : "使用自己的 API key"}
+            title={byoActive ? "已启用自带 API" : "使用自己的 API key"}
+            className="inline-flex items-center gap-1.5 font-sans text-sm text-clay-500 transition-colors hover:text-ember-500"
+          >
+            <i className="fa-solid fa-sliders text-[13px]" />
+            API
+            {byoActive && (
+              <span
+                aria-hidden
+                className="ml-0.5 inline-block h-1.5 w-1.5 rounded-full bg-ember-500"
+              />
+            )}
+          </button>
           <a
             href="https://github.com/zonghaoyuan/infiplot"
             target="_blank"
@@ -1826,6 +2232,9 @@ export default function HomePage() {
           setCustomStyleRefImage={setCustomStyleRefImage}
         />
       )}
+      {byoApiOpen && (
+        <ByoApiModal value={byoApi} onSave={saveByoApi} onClose={() => setByoApiOpen(false)} />
+      )}
     </div>
   );
 }

app/play/page.tsx

@@ -29,6 +29,23 @@ import type {
 import { track } from "@/lib/analytics";
 
 const MUTED_STORAGE_KEY = "infiplot:muted";
+const BYO_STORAGE_KEY = "infiplot:byoApi";
+
+function getByoHeaders(): Record<string, string> {
+  if (typeof window === "undefined") return {};
+  try {
+    const raw = localStorage.getItem(BYO_STORAGE_KEY);
+    if (raw) {
+      const parsed = JSON.parse(raw);
+      if (parsed.llm?.enabled || parsed.painter?.enabled) {
+        return { "x-byo-api": raw };
+      }
+    }
+  } catch {
+    /* ignore */
+  }
+  return {};
+}
 
 // Cap how long we wait for the browser to download + decode a scene image
 // before giving up and rendering anyway. Runware's CDN is usually <2s for a
@@ -267,7 +284,10 @@ function prefetchScenePath(
   const promise = (async () => {
     const res = await fetch("/api/scene", {
       method: "POST",
-      headers: { "Content-Type": "application/json" },
+      headers: {
+        "Content-Type": "application/json",
+        ...getByoHeaders(),
+      },
       body: JSON.stringify({ session: specSession }),
       signal: abort.signal,
     });
@@ -483,7 +503,10 @@ function PlayInner() {
       try {
         const res = await fetch("/api/beat-audio", {
           method: "POST",
-          headers: { "Content-Type": "application/json" },
+          headers: {
+            "Content-Type": "application/json",
+            ...getByoHeaders(),
+          },
           body: JSON.stringify({
             beat: { id: beat.id, line: beat.line, lineDelivery: beat.lineDelivery },
             voice: speaker.voice,
@@ -693,7 +716,10 @@ function PlayInner() {
         )
       : fetch("/api/start", {
           method: "POST",
-          headers: { "Content-Type": "application/json" },
+          headers: {
+            "Content-Type": "application/json",
+            ...getByoHeaders(),
+          },
           body: JSON.stringify(livePayload),
         }).then(async (r) => {
           if (!r.ok) {
@@ -918,7 +944,10 @@ function PlayInner() {
     const promise = (async () => {
       const res = await fetch("/api/scene", {
         method: "POST",
-        headers: { "Content-Type": "application/json" },
+        headers: {
+          "Content-Type": "application/json",
+          ...getByoHeaders(),
+        },
         body: JSON.stringify({ session: specSession }),
       });
       if (!res.ok) {
@@ -940,7 +969,10 @@ function PlayInner() {
       const annotatedImageBase64 = await annotateClick(imageUrl, click);
       const visionRes = await fetch("/api/vision", {
         method: "POST",
-        headers: { "Content-Type": "application/json" },
+        headers: {
+          "Content-Type": "application/json",
+          ...getByoHeaders(),
+        },
         body: JSON.stringify({ session, annotatedImageBase64 }),
       });
       if (!visionRes.ok) {
@@ -956,7 +988,10 @@ function PlayInner() {
         setPhase("inserting-beat");
         const insertRes = await fetch("/api/insert-beat", {
           method: "POST",
-          headers: { "Content-Type": "application/json" },
+          headers: {
+            "Content-Type": "application/json",
+            ...getByoHeaders(),
+          },
           body: JSON.stringify({
             session,
             freeformAction: decision.intent.freeformAction,
@@ -1036,7 +1071,10 @@ function PlayInner() {
         const promise = (async () => {
           const res = await fetch("/api/scene", {
             method: "POST",
-            headers: { "Content-Type": "application/json" },
+            headers: {
+              "Content-Type": "application/json",
+              ...getByoHeaders(),
+            },
             body: JSON.stringify({ session: specSession }),
           });
           if (!res.ok) {
@@ -1065,18 +1103,34 @@ function PlayInner() {
   // ── Render ────────────────────────────────────────────────────────────
 
   if (error) {
+    const isByoActive = typeof window !== "undefined" && (() => {
+      try {
+        const raw = localStorage.getItem(BYO_STORAGE_KEY);
+        if (raw) {
+          const parsed = JSON.parse(raw);
+          return parsed.llm?.enabled || parsed.painter?.enabled;
+        }
+      } catch {}
+      return false;
+    })();
+
     return (
       <div className="min-h-screen flex flex-col items-center justify-center px-8">
         <div className="max-w-md text-center animate-fade-in">
           <p className="text-[10px] smallcaps text-clay-500 mb-6">
             出 · 了 · 点 · 状 · 况
           </p>
-          <p className="font-serif italic text-clay-900 text-lg leading-[1.7] mb-10">
+          <p className="font-serif italic text-clay-900 text-lg leading-[1.7] mb-6">
             {error}
           </p>
+          {isByoActive && (
+            <p className="font-sans text-xs text-ember-600 mb-10 leading-relaxed">
+              提示：当前已启用「自带 API」。如果请求失败，请返回首页并检查右上角 API 配置的 Key、Endpoint 和 Model 是否正确，并确认您的服务额度充足。
+            </p>
+          )}
           <Link
             href="/"
-            className="text-[10px] smallcaps text-clay-700 hover:text-ember-500 transition-colors inline-flex items-center gap-3"
+            className={"text-[10px] smallcaps text-clay-700 hover:text-ember-500 transition-colors inline-flex items-center gap-3" + (isByoActive ? "" : " mt-4")}
           >
             <i className="fa-solid fa-arrow-left text-[9px]" />
             返 回