feat: 路由改名/kubectl预装/导出YAML精简/Service标签页优化/Alpine镜像源换清华

- 路由 /deploy/credentials → /deploy/configureTools
- kubectl 改为预装(Dockerfile) + 种子数据 preinstall
- 导出YAML精简: Service/Ingress/Deployment 全面清理运行时字段
- DeploymentEditService 只显示匹配 selector 的关联 Service
- Alpine 镜像源 mirrors.aliyun.com → mirrors.tuna.tsinghua.edu.cn

backend/internal/api/handlers/kubernetes.go

@@ -1605,13 +1605,14 @@ func (h *KubernetesHandler) listDeploymentsWithNS(c *gin.Context, ns string) {
 	deps, err := client.ListDeployments()
 	if err != nil { c.JSON(500, models.Response{Code: 500, Message: "K8s API error: " + err.Error()}); return }
 	type DepSummary struct {
-		Namespace         string `json:"namespace"`
-		Name              string `json:"name"`
-		Replicas          int    `json:"replicas"`
-		AvailableReplicas int    `json:"available_replicas"`
-		ReadyReplicas     int    `json:"ready_replicas"`
-		Image             string `json:"image"`
-		Paused            bool   `json:"paused"`
+		Namespace         string            `json:"namespace"`
+		Name              string            `json:"name"`
+		Replicas          int               `json:"replicas"`
+		AvailableReplicas int               `json:"available_replicas"`
+		ReadyReplicas     int               `json:"ready_replicas"`
+		Image             string            `json:"image"`
+		Paused            bool              `json:"paused"`
+		Selector          map[string]string `json:"selector,omitempty"` // matchLabels — 前端 Service Tab 关联用
 	}
 	result := []DepSummary{}
 	for _, d := range deps.Items {
@@ -1625,6 +1626,7 @@ func (h *KubernetesHandler) listDeploymentsWithNS(c *gin.Context, ns string) {
 			ReadyReplicas:     d.Status.ReadyReplicas,
 			Image:             image,
 			Paused:            d.Spec.Paused,
+			Selector:          func() map[string]string { if d.Spec.Selector != nil { return d.Spec.Selector.MatchLabels }; return nil }(),
 		})
 	}
 	c.JSON(200, models.Response{Code: 200, Data: result})