feat(k8s): 统一 YAML 查看编辑并补齐 Pod/导出能力

- 抽取 YamlCodeMirror/YamlEditorToolbar，修复弹窗滚动与固定高度布局
- 对齐集群导出精简规则（Service/Ingress/Workload/PVC 注解等）
- Deployment/Pod/Service/Ingress 分资源配置：Pod 只读，支持单文件下载
- 修复 Deployment Pod YAML 弹窗未渲染，补全 PodsTab 与详情页 YAML 入口
- 命名空间列表页新增导出 YAML（tar.gz），与集群导出 API 一致

frontend/src/components/kubernetes/YamlImportDialog.tsx

@@ -5,9 +5,7 @@ import { Button } from '@/components/ui/button';
 import { ModalOverlay } from '@/components/ui/modal-overlay';
 import { useToast } from '@/hooks/use-toast';
 import { kubernetesApi } from '@/api';
-import CodeMirror from '@uiw/react-codemirror';
-import { yaml } from '@codemirror/lang-yaml';
-import { oneDark } from '@codemirror/theme-one-dark';
+import { YamlCodeMirror } from './YamlCodeMirror';
 
 interface YamlImportDialogProps {
   clusterCode: string;
@@ -39,7 +37,7 @@ export function YamlImportDialog({ clusterCode, onClose, onApplied }: YamlImport
   return (
     <ModalOverlay onClose={onClose}>
       <div
-        className="bg-[var(--dg-bg-primary)] border border-[var(--dg-border)] rounded-xl w-[92vw] max-w-4xl max-h-[85vh] flex flex-col shadow-2xl"
+        className="bg-[var(--dg-bg-primary)] border border-[var(--dg-border)] rounded-xl w-[92vw] max-w-4xl h-[85vh] flex flex-col shadow-2xl"
         onClick={(e) => e.stopPropagation()}
       >
         <div className="flex items-center justify-between p-4 border-b border-[var(--dg-border)]">
@@ -52,19 +50,15 @@ export function YamlImportDialog({ clusterCode, onClose, onApplied }: YamlImport
           </div>
           <Button variant="ghost" size="icon" className="h-8 w-8" onClick={onClose}><X className="h-4 w-4" /></Button>
         </div>
-        <div className="flex-1 overflow-auto p-4">
-          <CodeMirror
+        <div className="flex-1 min-h-0 flex flex-col overflow-hidden p-4">
+          <YamlCodeMirror
             value={content}
-            height="420px"
-            theme={oneDark}
-            extensions={[yaml()]}
+            fill
+            fontSize="12px"
             onChange={setContent}
-            placeholder="粘贴 YAML 内容..."
-            basicSetup={{ lineNumbers: true, foldGutter: true, highlightActiveLine: true }}
-            style={{ fontSize: '12px' }}
           />
         </div>
-        <div className="flex justify-end gap-2 p-4 border-t border-[var(--dg-border)]">
+        <div className="flex justify-end gap-2 p-4 border-t border-[var(--dg-border)] shrink-0">
           <Button variant="outline" onClick={onClose}>取消</Button>
           <Button className="bg-blue-600 hover:bg-blue-700" onClick={apply} disabled={applying}>
             {applying ? <Loader2 className="h-4 w-4 animate-spin mr-1" /> : <Upload className="h-4 w-4 mr-1" />}