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/src/features/live/components/RecordingsSubPanel.tsx

@@ -121,7 +121,7 @@ export function RecordingsSubPanel() {
   return (
     <div className="space-y-3">
       {recordings.map((rec) => (
-        <div key={rec.id} className="rounded-xl border border-sky-200 bg-white">
+        <div key={rec.id} className="rounded-xl border border-border bg-card">
           <div className="flex items-center gap-4 p-4">
             <div className="flex h-10 w-10 shrink-0 items-center justify-center rounded-lg bg-primary/10 text-primary">
               <Mic className="h-5 w-5" />