Add per-cluster Tools Management and stop auto-installing side tools.

Introduce a catalog-driven Tools Management section under Clusters so
admins can install/uninstall infrastructure tools per cluster: cert-manager
(Helm/jetstack), ClusterIssuer (email + HTTP01 form, depends on cert-manager),
and central Elasticsearch. Cluster creation no longer auto-installs Elastic
or the cloudhost-node-cluster-dns DaemonSet; build bootstrap stays automatic.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

backend/src/clusters/clusters.module.ts

@@ -2,6 +2,8 @@ import { Module, forwardRef } from '@nestjs/common';
 import { TypeOrmModule } from '@nestjs/typeorm';
 import { ClustersService } from './clusters.service';
 import { ClustersController } from './clusters.controller';
+import { ClusterToolsService } from './cluster-tools.service';
+import { ClusterToolsController } from './cluster-tools.controller';
 import { Cluster } from './entities/cluster.entity';
 import { ClusterPool } from './entities/cluster-pool.entity';
 import { ClusterHealth } from './entities/cluster-health.entity';
@@ -13,8 +15,8 @@ import { KubernetesModule } from '../kubernetes/kubernetes.module';
     TypeOrmModule.forFeature([Cluster, ClusterPool, ClusterHealth, ClusterAllocationLog]),
     forwardRef(() => KubernetesModule),
   ],
-  controllers: [ClustersController],
-  providers: [ClustersService],
-  exports: [ClustersService],
+  controllers: [ClustersController, ClusterToolsController],
+  providers: [ClustersService, ClusterToolsService],
+  exports: [ClustersService, ClusterToolsService],
 })
 export class ClustersModule {}