feat(logging): add Elasticsearch admin and user logs API

Add admin endpoints for stack deploy/status and user-facing logs
query API. Register controllers and service in KubernetesModule.

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/src/kubernetes/kubernetes.module.ts

@@ -1,11 +1,15 @@
 import { Module, forwardRef } from '@nestjs/common';
 import { KubernetesService } from './kubernetes.service';
 import { HelmService } from './helm.service';
+import { ElasticsearchService } from './elasticsearch.service';
+import { ElasticsearchController } from './elasticsearch.controller';
+import { LogsController } from './logs.controller';
 import { ClustersModule } from '../clusters/clusters.module';
 
 @Module({
   imports: [forwardRef(() => ClustersModule)],
-  providers: [KubernetesService, HelmService],
-  exports: [KubernetesService, HelmService],
+  controllers: [ElasticsearchController, LogsController],
+  providers: [KubernetesService, HelmService, ElasticsearchService],
+  exports: [KubernetesService, HelmService, ElasticsearchService],
 })
 export class KubernetesModule {}