fix: scale replicas in response, K8s metrics client, quota precheck, auth tests

- Add GetMetrics method to MetricsClient interface and implement cluster metrics API
- Add QuotaPrecheck service for validating resource quotas before deployment
- Add auth DTO with role/permission models and auth handler tests
- Add instance diagnostics: mounted NFS volumes, labels, annotations in pod diagnostics
- Update workspace handler with GetWorkspace endpoint and shared-user list
- Fix monitoring handler to use correct service method name
- Add tail_lines fallback in instance handler for snake_case query params
- Update nginx config for SSE log streaming support (no buffering)
- Add comprehensive test coverage: auth_service_test, auth_handler_test,
  auth_dto_test, metrics_client_test, quota_precheck_test
- Update error messages for quota validation and instance operations
- ModifyModal: fix YAML lineWidth:0, modified keys summary, delta-only submit
- InstanceCard: correctly disable scale-minus when replicas <= 0
- SidebarLayout: add hover transition for sidebar items
- Update todo.md and lessons.md with latest fixes

backend/internal/adapter/input/http/rest/artifact_handler.go

@@ -126,6 +126,25 @@ func (h *ArtifactHandler) ListArtifacts(w http.ResponseWriter, r *http.Request)
 	respondJSON(w, http.StatusOK, tagResponses)
 }
 
+// ListRepositoryTags is a compatibility alias for clients that request tags
+// directly instead of the canonical artifacts endpoint.
+func (h *ArtifactHandler) ListRepositoryTags(w http.ResponseWriter, r *http.Request) {
+	vars := mux.Vars(r)
+	if vars["registry_id"] == "" {
+		registryID := r.URL.Query().Get("registry_id")
+		if registryID == "" {
+			registryID = r.URL.Query().Get("registryId")
+		}
+		if registryID == "" {
+			respondError(w, http.StatusBadRequest, "Missing registry ID", "registry_id query parameter is required")
+			return
+		}
+		vars["registry_id"] = registryID
+		r = mux.SetURLVars(r, vars)
+	}
+	h.ListArtifacts(w, r)
+}
+
 // GetArtifact 获取 artifact 详情
 // @Summary 获取 Artifact 详情
 // @Description 获取指定 Artifact 的详细信息