完善分层 AGENTS.md，便于快速定位代码

vite-frontend/src/pages/AGENTS.md

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+# VITE FRONTEND (pages) KNOWLEDGE BASE
+
+## OVERVIEW
+Route views rendered by `vite-frontend/src/App.tsx`. Several pages are large, single-file screens.
+
+## STRUCTURE
+```
+vite-frontend/src/pages/
+├── index.tsx            # Login + captcha flow
+├── dashboard.tsx
+├── forward.tsx          # Large
+├── tunnel.tsx           # Large
+├── node.tsx             # Large
+├── user.tsx             # Large
+├── config.tsx
+├── limit.tsx
+├── profile.tsx
+├── settings.tsx
+└── change-password.tsx
+```
+
+## WHERE TO LOOK
+| Task | Location | Notes |
+|------|----------|-------|
+| Login flow | `vite-frontend/src/pages/index.tsx` | Calls `login()` and stores `localStorage.token` |
+| API calls | `vite-frontend/src/api/index.ts` | Thin wrappers around `Network.post` |
+| Token expiration behavior | `vite-frontend/src/api/network.ts` | Clears localStorage + redirects on 401 |
+
+## CONVENTIONS
+- Pages call API wrappers from `vite-frontend/src/api/index.ts` (most endpoints are POST).