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

backend/src/applications/dto/application.dto.ts

@@ -118,3 +118,32 @@ export class UpdateApplicationDto {
   @Max(10)
   replicas?: number;
 }
+
+export class ScaleResourcesDto {
+  @ApiPropertyOptional({ example: '100m' })
+  @IsOptional()
+  @IsString()
+  cpuRequest?: string;
+
+  @ApiPropertyOptional({ example: '500m' })
+  @IsOptional()
+  @IsString()
+  cpuLimit?: string;
+
+  @ApiPropertyOptional({ example: '128Mi' })
+  @IsOptional()
+  @IsString()
+  memoryRequest?: string;
+
+  @ApiPropertyOptional({ example: '512Mi' })
+  @IsOptional()
+  @IsString()
+  memoryLimit?: string;
+
+  @ApiPropertyOptional({ example: 2, minimum: 1, maximum: 10 })
+  @IsOptional()
+  @IsNumber()
+  @Min(1)
+  @Max(10)
+  replicas?: number;
+}