feat(admin): Worker scaling controls via k8s API

- Add /api/k8s/workers endpoint to get deployment status
- Add /api/k8s/workers/scale endpoint to scale replicas (0-50)
- Add worker scaling UI to Tasks Dashboard (+/- 5 workers)
- Shows ready/desired replica count
- Uses in-cluster config in k8s, kubeconfig locally

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

backend/src/index.ts

@@ -146,6 +146,7 @@ import tasksRoutes from './routes/tasks';
 import workerRegistryRoutes from './routes/worker-registry';
 // Per TASK_WORKFLOW_2024-12-10.md: Raw payload access API
 import payloadsRoutes from './routes/payloads';
+import k8sRoutes from './routes/k8s';
 
 // Mark requests from trusted domains (cannaiq.co, findagram.co, findadispo.com)
 // These domains can access the API without authentication
@@ -230,6 +231,10 @@ console.log('[WorkerRegistry] Routes registered at /api/worker-registry');
 app.use('/api/payloads', payloadsRoutes);
 console.log('[Payloads] Routes registered at /api/payloads');
 
+// K8s control routes - worker scaling from admin UI
+app.use('/api/k8s', k8sRoutes);
+console.log('[K8s] Routes registered at /api/k8s');
+
 // Phase 3: Analytics V2 - Enhanced analytics with rec/med state segmentation
 try {
   const analyticsV2Router = createAnalyticsV2Router(getPool());