chore(core/qa): function-audit toolchain + parity/audit reports + pixel-perfect skill

- qa/function-audit: playwright 行为审计工具(audit.mjs/verify-modals.mjs/pages.json)
  + 18 页审计产出(*.audit.md/json、summary、运行日志)
- qa/visual-parity: 调试/测量辅助脚本(_dbg*.mjs/_measure.mjs/_off.mjs)
- core/还原度核对报告.md: 18 页 pixelmatch 核对结果(含 vite 代理陈旧坑记录)
- core/还原与接口待办.md: 逐页还原度/真实数据/交互接入待办总表
- .claude/skills/pixel-perfect-react: 像素级还原 React 的 SKILL 文档
- frontend/public/_devlogin.html: 临时本地登录辅助页(可删)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

core/qa/function-audit/package.json

@@ -0,0 +1,14 @@
+{
+  "name": "airshelf-function-audit",
+  "version": "0.1.0",
+  "private": true,
+  "type": "module",
+  "description": "逐页功能审计:驱动真实 React 路由,点遍每个按钮/切换/标签,报出「点了没反应」的死交互。",
+  "scripts": {
+    "audit": "node audit.mjs",
+    "audit:quick": "node audit.mjs --mode quick"
+  },
+  "dependencies": {
+    "playwright": "^1.57.0"
+  }
+}