Fix API routing for App Platform deployment

- Changed global prefix to use 'v1' in production instead of 'api/v1'
- App Platform ingress routes /api to backend, so backend only needs /v1 prefix
- Maintains backward compatibility: dev uses /api/v1, prod uses /v1

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

backend/src/main.ts

@@ -9,7 +9,11 @@ async function bootstrap() {
   const app = await NestFactory.create(AppModule);
 
   // Global prefix for all routes
-  app.setGlobalPrefix('api/v1');
+  // In production (App Platform), the ingress routes /api to this service
+  // So we only need /v1 prefix here
+  // In development, we need the full /api/v1 prefix
+  const isProduction = process.env.NODE_ENV === 'production';
+  app.setGlobalPrefix(isProduction ? 'v1' : 'api/v1');
 
   // Enable CORS
   app.enableCors({