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>

packages/engine/package.json

@@ -1,5 +1,5 @@
 {
-  "name": "@dada/engine",
+  "name": "@yume/engine",
   "version": "0.1.0",
   "private": true,
   "type": "module",
@@ -12,8 +12,8 @@
     "typecheck": "tsc --noEmit"
   },
   "dependencies": {
-    "@dada/ai-client": "workspace:*",
-    "@dada/types": "workspace:*",
+    "@yume/ai-client": "workspace:*",
+    "@yume/types": "workspace:*",
     "sharp": "^0.33.5"
   }
 }