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/output/summary.json

@@ -0,0 +1,74 @@
+[
+  {
+    "page": "asset-factory",
+    "blocked": 0,
+    "total": 24,
+    "works": 22,
+    "dead": 0,
+    "error": 0,
+    "disabled": 0,
+    "skipped": 0,
+    "noop": 2,
+    "missing": 4
+  },
+  {
+    "page": "image-optimize",
+    "blocked": 0,
+    "total": 24,
+    "works": 24,
+    "dead": 0,
+    "error": 0,
+    "disabled": 0,
+    "skipped": 0,
+    "noop": 0,
+    "missing": 12
+  },
+  {
+    "page": "model-photo",
+    "blocked": 0,
+    "total": 32,
+    "works": 31,
+    "dead": 0,
+    "error": 0,
+    "disabled": 0,
+    "skipped": 0,
+    "noop": 1,
+    "missing": 7
+  },
+  {
+    "page": "model-photo-demo-a",
+    "blocked": 0,
+    "total": 37,
+    "works": 33,
+    "dead": 0,
+    "error": 0,
+    "disabled": 0,
+    "skipped": 1,
+    "noop": 3,
+    "missing": 5
+  },
+  {
+    "page": "model-photo-demo-b",
+    "blocked": 0,
+    "total": 37,
+    "works": 36,
+    "dead": 0,
+    "error": 0,
+    "disabled": 0,
+    "skipped": 0,
+    "noop": 1,
+    "missing": 5
+  },
+  {
+    "page": "platform-cover",
+    "blocked": 0,
+    "total": 38,
+    "works": 35,
+    "dead": 0,
+    "error": 0,
+    "disabled": 0,
+    "skipped": 1,
+    "noop": 2,
+    "missing": 8
+  }
+]