Improve cluster allocation strategy.

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

backend/src/applications/applications.service.ts

@@ -179,6 +179,13 @@ export class ApplicationsService {
     return this.appsRepository.save(app);
   }
 
+  async updateClusterAssignment(id: string, clusterId: string, poolId?: string): Promise<Application> {
+    const app = await this.findOne(id);
+    app.clusterId = clusterId;
+    app.poolId = poolId || app.poolId;
+    return this.appsRepository.save(app);
+  }
+
   async saveSuspendedReplicas(
     id: string,
     snapshot: Record<string, number>,