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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frontend/vite.config.ts

@@ -9,7 +9,7 @@ export default defineConfig({
     port: 3000,
     proxy: {
       '/api': {
-        target: 'http://localhost:9119',
+        target: 'http://127.0.0.1:9119',
         changeOrigin: true,
         // Removed rewrite so /api prefix is preserved for backend route /api/v1/...
       },