refactor: rename project DADA → 云梦 (slug: yume)

- 所有 workspace 包 @dada/* → @yume/*，根包 dada → yume
- 全部导入路径同步更新
- 内部 ID 对齐：dada-ripple → yume-ripple，dada:custom → yume:custom
- 首页 / new / play 用户文案整段中文化，保留 smallcaps + 衬线 + 罗马数字排版语汇
- README 标题改为 "# 云梦"，部署链接与目录树 slug 改为 yume
- 重新生成 pnpm-lock.yaml

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/web/app/layout.tsx

@@ -2,9 +2,8 @@ import type { Metadata } from "next";
 import "./globals.css";
 
 export const metadata: Metadata = {
-  title: "Dada — AI Visual Novel",
-  description:
-    "An open-source visual novel where every frame is generated by AI.",
+  title: "云梦 — AI 视觉小说",
+  description: "一部由 AI 实时绘制每一帧的开源视觉小说。",
 };
 
 export default function RootLayout({