feat: prepare for Vercel deployment with PostgreSQL migration

vercel-post-deploy.js

@@ -0,0 +1,14 @@
+const { execSync } = require('child_process');
+
+async function runMigrations() {
+  try {
+    console.log('Running database migrations...');
+    execSync('npm run db:migrate', { stdio: 'inherit' });
+    console.log('Migrations completed successfully!');
+  } catch (error) {
+    console.error('Migration failed:', error);
+    process.exit(1);
+  }
+}
+
+runMigrations();