chore: migrate to PostgreSQL with Prisma

package.json

@@ -14,6 +14,7 @@
   },
   "dependencies": {
     "@formatjs/intl-localematcher": "^0.8.7",
+    "@prisma/client": "^6.2.1",
     "@tanstack/react-query": "^5.100.10",
     "bcryptjs": "^3.0.3",
     "imapflow": "^1.3.3",
@@ -39,6 +40,7 @@
     "dotenv": "^17.4.2",
     "eslint": "^9",
     "eslint-config-next": "16.2.6",
+    "prisma": "^6.2.1",
     "tailwindcss": "^4",
     "tsx": "^4.21.0",
     "typescript": "^5"