feat: complete E2E deployment flow with storage layered config and values template versioning

- Instance deployment: charts browser, deploy modal, instances list
- Values Template version management (create/history/rollback)
- Storage layered config (cluster > workspace > shared priority)
- Cluster credential decryptIfNeeded for mixed encrypted/plaintext kubeconfig
- YAML syntax validation (client-side + server-side warning)
- Frontend: charts, instances, storage, templates, admin pages
- Backend: storage service, instance service, cluster service, helm client
- Multi-Tenant Kubeconfig.md: added by user

backend/cmd/api/main.go

@@ -156,6 +156,9 @@ func main() {
 	storageService := service.NewStorageService(repos.StorageRepo)
 	storageHandler := rest.NewStorageHandler(storageService)
 
+	// Wire storage service into instance service for layered storage config
+	instanceService.SetStorageService(storageService)
+
 	// Chart Reference Handler
 	chartRefService := service.NewChartReferenceService(repos.ChartRefRepo, repos.RegistryRepo)
 	chartRefHandler := rest.NewChartReferenceHandler(chartRefService)
@@ -377,6 +380,7 @@ func setupRouter(
 	// ===== Storage Backend 路由 =====
 	api.HandleFunc("/storage-backends", storageHandler.CreateStorage).Methods(http.MethodPost)
 	api.HandleFunc("/storage-backends", storageHandler.GetAllStorage).Methods(http.MethodGet)
+	api.HandleFunc("/storage-backends/resolve", storageHandler.ResolveStorage).Methods(http.MethodGet)
 	api.HandleFunc("/storage-backends/{storage_id}", storageHandler.GetStorage).Methods(http.MethodGet)
 	api.HandleFunc("/storage-backends/{storage_id}", storageHandler.UpdateStorage).Methods(http.MethodPut)
 	api.HandleFunc("/storage-backends/{storage_id}", storageHandler.DeleteStorage).Methods(http.MethodDelete)