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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internal/module/k8s/k8s.go

@@ -0,0 +1,21 @@
+package k8s
+
+import (
+	"context"
+	"log"
+
+	"gitea.loveuer.com/loveuer/cluster/internal/model"
+	"gitea.loveuer.com/loveuer/cluster/pkg/store"
+	"gorm.io/gorm"
+)
+
+func Init(ctx context.Context, db *gorm.DB, store store.Store) error {
+	if err := db.AutoMigrate(
+		&model.ClusterConfig{},
+	); err != nil {
+		log.Fatalf("failed to migrate k8s database: %v", err)
+		return err
+	}
+
+	return nil
+}