feat: add PostgreSQL database support and development scripts

- Added pg and @types/pg dependencies for PostgreSQL integration
- Created database testing and backend initialization scripts
- Changed dev server port to 3002 to avoid conflicts

package.json

@@ -3,11 +3,13 @@
   "version": "0.1.0",
   "private": true,
   "scripts": {
-    "dev": "next dev",
+    "dev": "next dev -p 3002",
     "build": "next build",
     "start": "next start",
     "lint": "next lint",
-    "type-check": "tsc --noEmit"
+    "type-check": "tsc --noEmit",
+    "test:db": "node scripts/test-db.js",
+    "init:backend": "chmod +x scripts/init-backend.sh && ./scripts/init-backend.sh"
   },
   "dependencies": {
     "next": "14.0.4",
@@ -25,13 +27,15 @@
     "tailwind-merge": "^2.1.0",
     "tailwindcss-animate": "^1.0.7",
     "react-query": "^3.39.3",
-    "zustand": "^4.4.7"
+    "zustand": "^4.4.7",
+    "pg": "^8.11.3"
   },
   "devDependencies": {
     "typescript": "^5",
     "@types/node": "^20",
     "@types/react": "^18",
     "@types/react-dom": "^18",
+    "@types/pg": "^8.10.9",
     "autoprefixer": "^10.0.1",
     "postcss": "^8",
     "tailwindcss": "^3.3.0",