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/_q2.log

@@ -0,0 +1,21 @@
+
+[function-audit] projects … dead 0 / 24, missing 15
+[function-audit] projects-new … dead 0 / 15, missing 14
+[function-audit] pipeline … dead 0 / 29, missing 5
+[function-audit] library … dead 0 / 38, missing 6
+[function-audit] messages … dead 0 / 26, missing 11
+[function-audit] settings … dead 0 / 26, missing 4
+
+[function-audit] summary
+┌─────────┬────────────────┬───────┬───────┬──────┬───────┬─────────┐
+│ (index) │ page           │ total │ works │ dead │ error │ missing │
+├─────────┼────────────────┼───────┼───────┼──────┼───────┼─────────┤
+│ 0       │ 'projects'     │ 24    │ 22    │ 0    │ 0     │ 15      │
+│ 1       │ 'projects-new' │ 15    │ 15    │ 0    │ 0     │ 14      │
+│ 2       │ 'pipeline'     │ 29    │ 27    │ 0    │ 0     │ 5       │
+│ 3       │ 'library'      │ 38    │ 35    │ 0    │ 0     │ 6       │
+│ 4       │ 'messages'     │ 26    │ 25    │ 0    │ 0     │ 11      │
+│ 5       │ 'settings'     │ 26    │ 25    │ 0    │ 0     │ 4       │
+└─────────┴────────────────┴───────┴───────┴──────┴───────┴─────────┘
+
+报告:core/qa/function-audit/output/summary.md