feat: add k8s cluster resource management module

- Add K8s module with kubeconfig storage in cluster_config table
- Implement resource list APIs for 8 kinds: namespace, deployment, statefulset, service, configmap, pod, pv, pvc
- Add K8sResourceList page with sidebar navigation and resource tables
- Support YAML upload/input dialog for resource creation via dynamic client
- Add kubeconfig settings drawer
- Increase main content width from lg to xl for better table display
- Add navigation link for cluster resources in top bar

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dev.sh

@@ -47,6 +47,11 @@ if ! command -v go &> /dev/null; then
     exit 1
 fi
 
+if ! go build -o /dev/null .;then
+    echo -e "${RED}Error: backend can't compile.${NC}"
+    exit 1
+fi
+
 echo -e "${GREEN}Starting backend (Go)...${NC}"
 go run main.go &
 BACKEND_PID=$!
@@ -66,4 +71,4 @@ echo -e "${YELLOW}Frontend PID: $FRONTEND_PID${NC}"
 echo -e "${YELLOW}Press Ctrl+C to stop both services${NC}"
 
 # Wait for both processes
-wait $BACKEND_PID $FRONTEND_PID
+wait $BACKEND_PID $FRONTEND_PID