feat: migrate frontend to Astro + expand AI moderation + backend admin/runtime config

Frontend:
- migrate from Vite to Astro (astro.config.mjs, pages/, layouts/)
- add admin panel, settings page, command palette, error boundary
- refactor App.tsx, MascotChatbot, Sidebar, Header, DashboardLayout
- update API client, WebSocket, auth, dashboard features

Backend:
- add admin module and config routes
- refactor middlewares, Redis connection, WebSocket server/bridge
- add runtime config loader

Discord Gateway:
- refactor AI moderation: circuit breaker, concurrency limiter, fallback processor
- add media analysis client, Seaxng search, user profile learner
- add new drizzle migration

Shared:
- extend database schema, add new config fields

services/frontend/tsconfig.json

@@ -6,11 +6,15 @@
     "strict": true,
     "jsx": "react-jsx",
     "lib": ["ES2020", "DOM", "DOM.Iterable"],
-    "types": ["vite/client"],
+    "types": ["astro/client"],
     "noEmit": true,
     "skipLibCheck": true,
     "esModuleInterop": true,
-    "allowSyntheticDefaultImports": true
+    "allowSyntheticDefaultImports": true,
+    "baseUrl": ".",
+    "paths": {
+      "~/*": ["src/*"]
+    }
   },
-  "include": ["src/**/*", "vite.config.ts"]
+  "include": ["src/**/*", "astro.config.mjs"]
 }