chore(spec): 综合清理 + legacy-layer 迁移 spec/plan/data

主要改动:
- 切到 funplay-cocos-mcp v0.5.1 (用户级配置, 项目级 .mcp.json 删除)
- 仓库文档/CLAUDE.md/.gitignore 等清理过时 cocos-mcp-server 引用
- memory 文件同步: cocos-mcp-setup/path/blocker/spriteframe-uuid/prefab-persist 等加 funplay 实测警告
- memory 新建 funplay-cocos-mcp-pending-verification.md (后已被实测覆盖)
- spec/plan/data:
  - docs/superpowers/specs/2026-09-02-legacy-layer-migration-design.md
  - docs/superpowers/plans/2026-09-02-legacy-layer-migration.md
  - docs/superpowers/data/layer-spirit-summary.json
- YouleNexus: profiles.ts / defaults.ts / PlayerInfoView.prefab / scene 改动

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

cocoscreator_projects/YouleNexus/settings/v2/packages/project.json

@@ -2,9 +2,9 @@
   "__version__": "1.0.6",
   "general": {
     "designResolution": {
-      "width": 1280,
+      "width": 1600,
       "height": 720,
-      "fitWidth": false,
+      "fitWidth": true,
       "fitHeight": true
     }
   }