Phase 3 Completed

src/modules/health/health.service.ts

@@ -0,0 +1,12 @@
+import { Injectable } from '@nestjs/common';
+
+@Injectable()
+export class HealthService {
+  async getHealth() {
+    return {
+      status: 'ok',
+      timestamp: new Date().toISOString(),
+      service: 'raylab-core',
+    };
+  }
+}