new file: .dockerignore

new file:   .env.example
	new file:   Dockerfile
	modified:   backend/.env.example
	modified:   backend/package.json
	renamed:    backend/src/migrations/run.ts -> backend/src/scripts/run.ts
	renamed:    backend/src/migrations/seed.ts -> backend/src/scripts/seed.ts
	new file:   docker-compose.external-db.yml
	new file:   docker-compose.yml

backend/src/scripts/run.ts

@@ -6,14 +6,18 @@ async function runMigrations() {
   console.log('Running migrations...');
 
   try {
-    const migrationFile = fs.readFileSync(
-      path.join(__dirname, '001_initial_schema.sql'),
-      'utf-8'
-    );
+    const migrationsDir = path.join(__dirname, '../migrations');
+    const files = fs.readdirSync(migrationsDir)
+      .filter(f => f.endsWith('.sql'))
+      .sort();
+
+    for (const file of files) {
+      console.log(`  Running ${file}...`);
+      const sql = fs.readFileSync(path.join(migrationsDir, file), 'utf-8');
+      await mainPool.query(sql);
+    }
 
-    await mainPool.query(migrationFile);
     console.log('✅ Migrations completed successfully');
-
     process.exit(0);
   } catch (error) {
     console.error('❌ Migration failed:', error);