feat(k8s): M3 Pod文件上传 + ExecInPod WebSocket协议重写

M3: Pod 文件上传
- 后端: POST .../pods/:pod/files/upload (multipart, base64分块exec写入)
- 前端: PodFileBrowser 增加上传按钮 + FormData API
- 路由: 新增 Kuboard (:clusterCode) + 旧 (:id) 两套路由

重大修复: ExecInPod 从 raw HTTP SPDY 改为 WebSocket channel.k8s.io
- 旧方案: HTTP POST + SPDY upgrade → 无法解析响应（协议头缺失 + 帧解析复杂）
- 新方案: gorilla/websocket Dialer + channel.k8s.io 子协议 → 和 ExecTerminal 一致
- 影响: 文件浏览/下载/上传全部恢复正常

修复: BusyBox ls 解析
- BusyBox 不支持 --time-style 参数，默认输出 Mon DD HH:MM 格式
- 解析器改为自动检测 GNU vs BusyBox 日期格式

frontend/src/components/kubernetes/PodFileBrowser.tsx

@@ -15,7 +15,7 @@ import {
 } from '@/components/ui/select';
 import {
   Folder, FolderOpen, FileText, FileCode, FileArchive, FileImage,
-  File, Download, Eye, ChevronRight, ArrowLeft, ArrowRight, ArrowUp,
+  File, Download, Upload, Eye, ChevronRight, ArrowLeft, ArrowRight, ArrowUp,
   RotateCw, Loader2, Maximize2, Minimize2, X, Box, Home, HardDrive,
   AlertCircle, FileType, Binary,
 } from 'lucide-react';
@@ -156,6 +156,10 @@ export function PodFileBrowser({
   // 预览
   const [preview, setPreview] = useState<{ path: string; content: string; loading: boolean } | null>(null);
 
+  // 上传
+  const [uploading, setUploading] = useState(false);
+  const fileInputRef = useRef<HTMLInputElement>(null);
+
   // 选中的条目（用于高亮）
   const [selected, setSelected] = useState<string>('');
 
@@ -287,6 +291,26 @@ export function PodFileBrowser({
     toast({ title: '已开始下载', description: path });
   }, [clusterCode, namespace, podName, container, toast]);
 
+  // 上传文件
+  const handleUpload = useCallback(async (files: FileList | null) => {
+    if (!files || files.length === 0) return;
+    setUploading(true);
+    try {
+      for (const file of Array.from(files)) {
+        await kubernetesApi.uploadPodFile(clusterCode, namespace, podName, currentPath, file, container || undefined);
+        toast({ title: '上传成功', description: `${file.name} → ${currentPath}/${file.name}` });
+      }
+      // 刷新文件列表
+      loadPath(currentPath);
+    } catch (e: any) {
+      toast({ title: '上传失败', description: e?.message || String(e), variant: 'destructive' });
+    } finally {
+      setUploading(false);
+      // 清空 input 允许重复上传同一文件
+      if (fileInputRef.current) fileInputRef.current.value = '';
+    }
+  }, [clusterCode, namespace, podName, container, currentPath, loadPath, toast]);
+
   const breadcrumbs = useMemo(() => pathSegments(currentPath), [currentPath]);
 
   return (
@@ -331,6 +355,23 @@ export function PodFileBrowser({
             <Button variant="ghost" size="sm" className="h-8 px-2" onClick={() => loadPath(currentPath)} title="刷新">
               <RotateCw className={cn('h-3.5 w-3.5', loading && 'animate-spin')} />
             </Button>
+            <Button
+              variant="ghost"
+              size="sm"
+              className="h-8 px-2"
+              disabled={uploading}
+              onClick={() => fileInputRef.current?.click()}
+              title="上传文件"
+            >
+              {uploading ? <Loader2 className="h-3.5 w-3.5 animate-spin" /> : <Upload className="h-3.5 w-3.5" />}
+            </Button>
+            <input
+              ref={fileInputRef}
+              type="file"
+              className="hidden"
+              multiple
+              onChange={(e) => handleUpload(e.target.files)}
+            />
             <button
               onClick={() => setFullscreen(!fullscreen)}
               className="p-1.5 rounded hover:bg-[var(--dg-bg-hover)] text-[var(--dg-text-secondary)]"