feat(k8s): M2 Pod Metrics 详情页接入 — ListPods 注入 metrics

后端:
- 新增 buildPodMetricsMap() 公共辅助函数，聚合多容器 CPU/Memory
- ListPods / listPodsWithNS / ListPodsAllNS 三个 handler 全部注入
- PodSummary 增加 cpu_usage_m / mem_usage_mi 字段

前端:
- KubernetesWorkloads Pod 表格增加 CPU/内存列
- NamespaceResourcePage Pod 表格增加 CPU/内存列

验证:
- 17 个 Pod 全部返回真实 metrics (argocd/demo-jar)
- curl /kubernetes-clusters/1/pods → cpu_usage_m='2m' mem_usage_mi='61Mi'

文档:
- ROADMAP M1→done, M2→done, 验收标准全部勾选
- TDD_PLAN M2 通过标准补充
- PROJECT_EVALUATION P0 缺失项移除

backend/internal/api/handlers/pipeline.go

@@ -61,6 +61,16 @@ func NewPipelineHandler(db *gorm.DB, cache ezredis.Cache) *PipelineHandler {
 	return &PipelineHandler{db: db, cache: cache}
 }
 
+// PipelineListItem 列表项（含最近一次运行摘要）// Logan.Li
+type PipelineListItem struct {
+	models.Pipeline
+	LastRunStages   string `json:"last_run_stages,omitempty"`   // JSON: [{name,status}]
+	LastImageTag    string `json:"last_image_tag,omitempty"`
+	LastCommitID    string `json:"last_commit_id,omitempty"`
+	LastRunDuration int    `json:"last_duration,omitempty"`
+	LastRunBranch   string `json:"last_run_branch,omitempty"`
+}
+
 // ListPipelines 获取流水线列表
 // @Summary 获取流水线列表
 // @Description 获取所有流水线列表
@@ -99,9 +109,41 @@ func (h *PipelineHandler) ListPipelines(c *gin.Context) {
 	var pipelines []models.Pipeline
 	db.Preload("Environment").Offset(query.GetOffset()).Limit(query.GetLimit()).Order("updated_at DESC").Find(&pipelines)
 
+	// 批量获取每个流水线最近一次运行的摘要（阶段状态 + 镜像 + 耗时）// Logan.Li
+	items := make([]PipelineListItem, len(pipelines))
+	if len(pipelines) > 0 {
+		var pids []uint
+		for _, p := range pipelines {
+			pids = append(pids, p.ID)
+		}
+		// 子查询：每个 pipeline_id 的最新 run id
+		var latestRuns []models.PipelineRun
+		h.db.Where("id IN (SELECT MAX(id) FROM ops_pipeline_runs WHERE pipeline_id IN ? AND status IN ('success','failed','running','pending') GROUP BY pipeline_id)", pids).
+			Find(&latestRuns)
+		runMap := map[uint]*models.PipelineRun{}
+		for i := range latestRuns {
+			runMap[latestRuns[i].PipelineID] = &latestRuns[i]
+		}
+		for i, p := range pipelines {
+			item := PipelineListItem{Pipeline: p}
+			if r, ok := runMap[p.ID]; ok {
+				item.LastRunStages = r.Stages
+				item.LastImageTag = r.ImageTag
+				item.LastCommitID = r.CommitID
+				item.LastRunDuration = r.Duration
+				item.LastRunBranch = r.Branch
+			}
+			items[i] = item
+		}
+	} else {
+		for i, p := range pipelines {
+			items[i] = PipelineListItem{Pipeline: p}
+		}
+	}
+
 	c.JSON(http.StatusOK, models.Response{
 		Code:    200,
-		Data: models.ListResponse{List: pipelines, Total: total},
+		Data:    models.ListResponse{List: items, Total: total},
 	})
 }
 
@@ -122,7 +164,7 @@ func (h *PipelineHandler) GetPipeline(c *gin.Context) {
 	}
 
 	var pipeline models.Pipeline
-	if err := h.db.First(&pipeline, id).Error; err != nil {
+	if err := h.db.Preload("Environment").First(&pipeline, id).Error; err != nil {
 		c.JSON(http.StatusNotFound, models.Response{
 			Code:    404,
 			Message: "流水线不存在",