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/backend/src/e2e.test.ts

@@ -4,7 +4,15 @@
  */
 import { describe, it, expect } from "vitest";
 
-const BASE = process.env.API_BASE ?? "https://imphnen.asepharyana.my.id/api";
+// Safety: never default to a production URL — forces explicit opt-in
+// via: API_BASE=http://localhost:3001/api vitest run
+const RAW = process.env.API_BASE;
+if (!RAW) {
+  throw new Error(
+    "API_BASE is not set. Run with: API_BASE=http://localhost:3001/api vitest run",
+  );
+}
+const BASE = RAW;
 
 async function api(path: string, init?: RequestInit) {
   const res = await fetch(`${BASE}${path}`, {