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

frontend/src/components/layout/Sidebar.tsx

@@ -7,7 +7,7 @@ import {
   CheckSquare, PlayCircle, Settings, ChevronDown, ChevronRight,
   Terminal, Cpu, Database, FileCode, Shield, Users,
   Menu, Network, CloudCog, Globe, MapPin, Key,
-  Brain, FileTerminal, Activity, BarChart3, GitBranch,
+  Brain, Activity, BarChart3, GitBranch,
   Bot, AlertTriangle, Container, Boxes, Clock, Rocket,
 } from 'lucide-react';
 import { Button } from '@/components/ui/button';
@@ -93,7 +93,7 @@ const menuItems: MenuItem[] = [
     children: [
       { id: 'cronjobs', name: '定时任务', icon: PlayCircle, path: '/cronjobs' },
       { id: 'scripts', name: '脚本库', icon: FileCode, path: '/scripts' },
-      { id: 'ansible', name: 'Ansible', icon: FileTerminal, path: '/ansible' },
+      { id: 'ansible', name: '远程执行', icon: Terminal, path: '/remote-exec' },
     ],
   },
   {