feat: scale instances, --reuse-values, values diff, UI redesign, hover animations

Backend (Phase 1):
- Add ScaleInstance endpoint (POST /clusters/{id}/instances/{id}/scale)
- Add GetInstanceValuesDiff endpoint (GET .../values-diff)
- Enable ReuseValues=true in Helm Upgrade for --reuse-values behavior
- Add GetValues/GetChartDefaultValues to HelmClient interface
- Add ScaleInstanceRequest/Response and InstanceValuesDiffResponse DTOs

Frontend (Phase 2):
- InstanceCard: +/- scale buttons with loading spinner
- ModifyModal: values diff view (current vs defaults), Use Defaults button
- ArtifactBrowserPage: collapsible sidebar, compact tag grid, search filter
- TagCard: "LATEST" badge, compact layout, responsive design
- InstanceCard: compact 3-column layout, fewer scrolls needed
- InstancesManagementPage: 3-column grid, compact view
- Global hover-lift and hover-glow CSS utilities
- SidebarNav: subtle hover transition on links

backend/internal/adapter/input/http/dto/instance_dto.go

@@ -206,6 +206,25 @@ type InstanceEventDiagnostics struct {
 	LastTimestamp  string `json:"lastTimestamp,omitempty"`
 }
 
+// ScaleInstanceRequest 扩缩容实例请求
+type ScaleInstanceRequest struct {
+	Replicas int    `json:"replicas" binding:"required"`
+	Workload string `json:"workload"`
+}
+
+// ScaleInstanceResponse 扩缩容实例响应
+type ScaleInstanceResponse struct {
+	Instance *InstanceResponse `json:"instance"`
+	Replicas int               `json:"replicas"`
+	Message  string            `json:"message"`
+}
+
+// InstanceValuesDiffResponse 实例 values 差异响应
+type InstanceValuesDiffResponse struct {
+	Current  map[string]interface{} `json:"current"`
+	Defaults map[string]interface{} `json:"defaults"`
+}
+
 type InstancePodLogResponse struct {
 	Pod       string `json:"pod"`
 	Container string `json:"container"`

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

@@ -371,6 +371,49 @@ func (h *InstanceHandler) StreamInstanceLogs(w http.ResponseWriter, r *http.Requ
 	}
 }
 
+// ScaleInstance 扩缩容实例
+func (h *InstanceHandler) ScaleInstance(w http.ResponseWriter, r *http.Request) {
+	vars := mux.Vars(r)
+	clusterID := vars["cluster_id"]
+	instanceID := vars["instance_id"]
+
+	var req dto.ScaleInstanceRequest
+	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
+		respondError(w, http.StatusBadRequest, "Invalid request body", err.Error())
+		return
+	}
+	if req.Replicas < 0 {
+		respondError(w, http.StatusBadRequest, "Invalid replicas", "replicas must be >= 0")
+		return
+	}
+
+	result, err := h.instanceService.ScaleInstance(r.Context(), clusterID, instanceID, req.Replicas, req.Workload)
+	if err != nil {
+		respondServiceError(w, err, "Failed to scale instance")
+		return
+	}
+
+	respondJSON(w, http.StatusOK, dto.ScaleInstanceResponse{
+		Instance: convertInstanceResponse(result, true),
+		Replicas: req.Replicas,
+		Message:  fmt.Sprintf("Scaled to %d replicas", req.Replicas),
+	})
+}
+
+// GetInstanceValuesDiff 获取实例 values 差异
+func (h *InstanceHandler) GetInstanceValuesDiff(w http.ResponseWriter, r *http.Request) {
+	vars := mux.Vars(r)
+	clusterID := vars["cluster_id"]
+	instanceID := vars["instance_id"]
+
+	diff, err := h.instanceService.GetInstanceValuesDiff(r.Context(), clusterID, instanceID)
+	if err != nil {
+		respondServiceError(w, err, "Failed to get values diff")
+		return
+	}
+	respondJSON(w, http.StatusOK, diff)
+}
+
 func convertInstanceEntry(entry *entity.InstanceEntry) *dto.InstanceEntryResponse {
 	portResponses := make([]dto.InstanceEntryPortResponse, 0, len(entry.Ports))
 	for _, port := range entry.Ports {

backend/internal/adapter/output/helm/mock/helm_client_mock.go

@@ -194,3 +194,13 @@ func (c *HelmClientMock) GetValues(ctx context.Context, cluster *entity.Cluster,
 	return instance.Values, nil
 }
 
+func (c *HelmClientMock) GetChartDefaultValues(chartPath string) (map[string]interface{}, error) {
+	return map[string]interface{}{
+		"replicaCount": 1,
+		"image": map[string]interface{}{
+			"repository": "nginx",
+			"tag":        "latest",
+		},
+	}, nil
+}
+

backend/internal/adapter/output/helm/real/helm_client.go

@@ -159,6 +159,7 @@ func (h *HelmClient) Upgrade(ctx context.Context, cluster *entity.Cluster, insta
 
 	upgrade := action.NewUpgrade(actionConfig)
 	upgrade.Namespace = instance.Namespace
+	upgrade.ReuseValues = true
 	upgrade.Wait = true
 	upgrade.Timeout = helmOperationTimeout()
 
@@ -321,6 +322,7 @@ func (h *HelmClient) GetValues(ctx context.Context, cluster *entity.Cluster, rel
 	defer cleanup()
 
 	getValues := action.NewGetValues(actionConfig)
+	getValues.AllValues = true
 	values, err := getValues.Run(releaseName)
 	if err != nil {
 		return nil, fmt.Errorf("failed to get values: %w", err)
@@ -329,6 +331,21 @@ func (h *HelmClient) GetValues(ctx context.Context, cluster *entity.Cluster, rel
 	return values, nil
 }
 
+// GetChartDefaultValues 从 chart 包中读取默认 values
+func (h *HelmClient) GetChartDefaultValues(chartPath string) (map[string]interface{}, error) {
+	chart, err := loader.Load(chartPath)
+	if err != nil {
+		return nil, fmt.Errorf("failed to load chart: %w", err)
+	}
+	vals := make(map[string]interface{})
+	if chart.Values != nil {
+		for k, v := range chart.Values {
+			vals[k] = v
+		}
+	}
+	return vals, nil
+}
+
 // convertReleaseToInstance 转换 Helm Release 为 Instance
 func (h *HelmClient) convertReleaseToInstance(rel *release.Release) *entity.Instance {
 	return &entity.Instance{