improvement: docker infrastructure overhauled.

backend/src/app.controller.ts

@@ -22,4 +22,13 @@ export class AppController {
   getHello(): string {
     return this.appService.getHello();
   }
+
+  /** Used by Docker / load balancer health checks (GET /api/health) */
+  @Get('health')
+  health() {
+    return {
+      status: 'ok',
+      timestamp: new Date().toISOString(),
+    };
+  }
 }