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/dto/instance_dto.go

@@ -2,25 +2,25 @@ package dto
 
 // CreateInstanceRequest 创建实例请求
 type CreateInstanceRequest struct {
-	Name           string                 `json:"name" binding:"required"`
-	Namespace      string                 `json:"namespace" binding:"required"`
-	RegistryID     string                 `json:"registryId" binding:"required"`
-	RegistryIDAlt  string                 `json:"registry_id"`
-	Repository     string                 `json:"repository" binding:"required"`
-	Tag            string                 `json:"tag" binding:"required"`
-	Description    string                 `json:"description"`
-	Values         map[string]interface{} `json:"values"`
-	ValuesYAML     string                 `json:"valuesYaml"`
-	ValuesYAMLAlt  string                 `json:"values_yaml"`
+	Name          string                 `json:"name" binding:"required"`
+	Namespace     string                 `json:"namespace" binding:"required"`
+	RegistryID    string                 `json:"registryId" binding:"required"`
+	RegistryIDAlt string                 `json:"registry_id"`
+	Repository    string                 `json:"repository" binding:"required"`
+	Tag           string                 `json:"tag" binding:"required"`
+	Description   string                 `json:"description"`
+	Values        map[string]interface{} `json:"values"`
+	ValuesYAML    string                 `json:"valuesYaml"`
+	ValuesYAMLAlt string                 `json:"values_yaml"`
 }
 
 // UpdateInstanceRequest 更新实例请求
 type UpdateInstanceRequest struct {
-	Version      string                 `json:"version"`
-	Description  string                 `json:"description"`
-	Values       map[string]interface{} `json:"values"`
-	ValuesYAML   string                 `json:"valuesYaml"`
-	ValuesYAMLAlt string                `json:"values_yaml"`
+	Version       string                 `json:"version"`
+	Description   string                 `json:"description"`
+	Values        map[string]interface{} `json:"values"`
+	ValuesYAML    string                 `json:"valuesYaml"`
+	ValuesYAMLAlt string                 `json:"values_yaml"`
 }
 
 // Normalize 将多种命名风格的字段合并到统一字段
@@ -67,6 +67,7 @@ type InstanceResponse struct {
 	Status         string                 `json:"status"`
 	WorkspaceID    string                 `json:"workspaceId"`
 	OwnerID        string                 `json:"ownerId"`
+	OwnerUsername  string                 `json:"ownerUsername,omitempty"`
 	AllowedActions []string               `json:"allowedActions,omitempty"`
 	StatusReason   string                 `json:"statusReason,omitempty"`
 	LastOperation  string                 `json:"lastOperation,omitempty"`