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

This reverts commit d59b59a7a7.

services/backend/package.json

@@ -17,11 +17,9 @@
     "@bete/shared": "workspace:*",
     "@discordjs/voice": "^0.19.2",
     "axios": "^1.16.1",
-    "cors": "^2.8.6",
     "dotenv": "^17.4.2",
     "drizzle-orm": "^0.45.2",
     "express": "^5.2.1",
-    "express-rate-limit": "^8.5.2",
     "helmet": "^8.1.0",
     "ioredis": "^5.11.0",
     "pg": "^8.21.0",
@@ -32,14 +30,12 @@
   },
   "devDependencies": {
     "@biomejs/biome": "latest",
-    "@types/cors": "^2.8.19",
     "@types/express": "^5.0.6",
-    "@types/express-rate-limit": "^6.0.2",
     "@types/node": "^25.9.0",
-    "@types/pg": "^8.20.0",
     "@types/ws": "^8.18.1",
     "tsx": "^4.22.2",
     "typescript": "^5.9.3",
+    "@types/pg": "^8.20.0",
     "vitest": "latest"
   }
 }