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

src/app/api/sync/route.ts

@@ -0,0 +1,53 @@
+import { NextRequest, NextResponse } from 'next/server'
+import { MetadataFetcher } from '@/services/metadataFetcher'
+
+export async function POST(request: NextRequest) {
+  try {
+    const body = await request.json()
+    const { platform_id, all_platforms } = body
+
+    if (all_platforms) {
+      // Sync all platforms
+      await MetadataFetcher.syncAllPlatforms()
+      return NextResponse.json({ 
+        message: 'All platforms synced successfully',
+        timestamp: new Date().toISOString()
+      })
+    } else if (platform_id) {
+      // Sync specific platform
+      await MetadataFetcher.syncPlatform(platform_id)
+      return NextResponse.json({ 
+        message: `Platform ${platform_id} synced successfully`,
+        timestamp: new Date().toISOString()
+      })
+    } else {
+      return NextResponse.json(
+        { error: 'Either platform_id or all_platforms must be specified' },
+        { status: 400 }
+      )
+    }
+  } catch (error) {
+    console.error('Error during sync:', error)
+    return NextResponse.json(
+      { error: 'Sync failed', details: error instanceof Error ? error.message : 'Unknown error' },
+      { status: 500 }
+    )
+  }
+}
+
+export async function GET() {
+  try {
+    // Return sync status (would need to implement status tracking)
+    return NextResponse.json({
+      status: 'ready',
+      last_sync: null,
+      platforms: ['ubuntu', 'fedora', 'arch', 'windows', 'macos']
+    })
+  } catch (error) {
+    console.error('Error getting sync status:', error)
+    return NextResponse.json(
+      { error: 'Failed to get sync status' },
+      { status: 500 }
+    )
+  }
+}