refactor: replace Next.js server with Uvicorn for backend, remove backfill script

package.json

@@ -3,10 +3,8 @@
   "version": "0.1.0",
   "private": true,
   "scripts": {
-    "dev": "next dev -p 3001",
-    "build": "next build",
-    "start": "next start -p 3001",
-    "lint": "eslint ."
+    "dev": "uv run uvicorn app.main:app --reload --host 0.0.0.0 --port 8000",
+    "start": "uv run uvicorn app.main:app --host 0.0.0.0 --port 8000"
   },
   "dependencies": {
     "@auth/prisma-adapter": "^2.11.1",
@@ -52,7 +50,6 @@
     "input-otp": "1.4.2",
     "lucide-react": "^0.564.0",
     "mammoth": "^1.11.0",
-    "mongoose": "^9.2.4",
     "next": "16.1.6",
     "next-auth": "^4.24.13",
     "next-themes": "^0.4.6",