feat: add resource monitoring and live scaling

- Backend: getResourceUsage() method in KubernetesService fetches real-time
  CPU/Memory metrics from K8s metrics-server API per pod
- Backend: updateResources() method patches live K8s deployments with new
  CPU/Memory requests+limits and replica count
- Backend: GET /applications/:id/resources endpoint for monitoring
- Backend: PATCH /applications/:id/resources endpoint for scaling
- Backend: ScaleResourcesDto with validation for resource fields
- Frontend: Resource monitoring card with per-pod CPU/Memory progress bars
  (color-coded: green < 50%, yellow < 80%, red > 80%)
- Frontend: Pod status table showing phase, readiness, restarts
- Frontend: Scaling controls for CPU request/limit, memory request/limit,
  and replicas with +/- buttons
- Frontend: Auto-refresh metrics every 5 seconds when monitoring is open
- Frontend: parseCpuToMillicores/parseMemoryToMi helpers for metric parsing

frontend/src/types/index.ts

@@ -92,3 +92,31 @@ export interface CreateApplicationDto {
   replicas?: number;
   port?: number;
 }
+
+export interface PodInfo {
+  name: string;
+  status: string;
+  ready: boolean;
+  restarts: number;
+  startedAt?: string;
+}
+
+export interface PodMetric {
+  name: string;
+  cpu: string;
+  memory: string;
+}
+
+export interface ResourceUsage {
+  configured: {
+    cpuRequest: string;
+    cpuLimit: string;
+    memoryRequest: string;
+    memoryLimit: string;
+    replicas: number;
+    readyReplicas: number;
+    availableReplicas: number;
+  };
+  pods: PodInfo[];
+  metrics: PodMetric[];
+}