feat(rdp): 新增 RDP 远程桌面/SMB/账单同步能力 + 清理编译产物

主要变更：
- RDP 远程桌面：新增 backend/pkg/rdp（RDP 引擎 + credssp/display/rle/trace）、
  backend/controller/rdp*（连接/凭证/文件/会话/实时）、frontend RDP 组件与 API
- Windows SMB 文件传输：backend/pkg/winsmb
- 云账单同步：backend/pkg/billingsync + billing_sync/aliyun_billing，前端账单详情
- Agent CLI Kubernetes 工具：kubernetes_action/get、pod_execute/logs
- 服务器导入助手：server_import_helpers、ImportCredentialSettings
- 国际化与组件重构（cloud/deploy/monitor/server/system 等多模块）
- 清理编译产物二进制：移除 backend/server、backend/agent/bin/aiops-agent-*
- .gitignore：新增 backend/agent/ 与 .cache/（避免 334MB go-build 缓存误入库）

Co-Authored-By: Claude <noreply@anthropic.com>

frontend/src/components/kubernetes/KubectlTerminal.tsx

@@ -10,8 +10,9 @@ import { FitAddon } from 'xterm-addon-fit';
 import 'xterm/css/xterm.css';
 import { Terminal, Maximize2, Minimize2, X, Loader2 } from 'lucide-react';
 import { cn } from '@/lib/utils';
+import { attachTerminalResize, mountXterm } from '@/lib/xterm-utils';
 import { useUserStore } from '@/store';
-import i18n from '@/i18n';
+import { TerminalLoadingOverlay } from '@/components/common/TerminalLoadingOverlay';
 
 interface KubectlTerminalProps {
   open: boolean;
@@ -28,6 +29,7 @@ export function KubectlTerminal({ open, onOpenChange, clusterId, clusterName }:
   const [connected, setConnected] = useState(false);
   const [fullscreen, setFullscreen] = useState(false);
   const [error, setError] = useState('');
+  const [hasOutput, setHasOutput] = useState(false);
 
   // 重置全屏状态
   useEffect(() => {
@@ -37,6 +39,7 @@ export function KubectlTerminal({ open, onOpenChange, clusterId, clusterName }:
   // 连接终端
   useEffect(() => {
     if (!open || !clusterId) return;
+    setHasOutput(false);
 
     const term = new XTerm({
       cursorBlink: true,
@@ -79,40 +82,33 @@ export function KubectlTerminal({ open, onOpenChange, clusterId, clusterName }:
       try {
         const msg = JSON.parse(event.data);
         if (msg.status === 0 && typeof msg.data === 'string') {
+          setHasOutput(true);
           term.write(msg.data);
         }
       } catch {
-        if (typeof event.data === 'string') term.write(event.data);
+        if (typeof event.data === 'string') {
+          setHasOutput(true);
+          term.write(event.data);
+        }
       }
     };
 
     ws.onopen = () => {
       setConnected(true);
       setError('');
-      if (containerRef.current) {
-        term.open(containerRef.current);
-        requestAnimationFrame(() => {
-          try {
-            fit.fit();
-          } catch { /* noop */ }
-        });
-        // 延迟 focus：确保 Dialog 渲染完成后再聚焦终端
-        setTimeout(() => {
-          try {
-            term.focus();
-          } catch { /* noop */ }
-        }, 150);
-      }
+      mountXterm(term, fit, () => containerRef.current, ws);
     };
 
     ws.onclose = () => {
       setConnected(false);
-      term.write(i18n.t('kubernetes.kubectlterminal.sf4ee00d1'));
+      setHasOutput(true);
+      term.write('\r\n\x1b[31m[连接已断开]\x1b[0m\r\n');
     };
 
     ws.onerror = () => {
-      setError(i18n.t('aiops.wsConnectFailed'));
-      term.write(i18n.t('kubernetes.podexecterminal.sc8107726'));
+      setError('WebSocket 连接失败');
+      setHasOutput(true);
+      term.write('\r\n\x1b[31m[连接发生错误]\x1b[0m\r\n');
     };
 
     return () => {
@@ -128,35 +124,24 @@ export function KubectlTerminal({ open, onOpenChange, clusterId, clusterName }:
     };
   }, [open, clusterId]);
 
-  // ResizeObserver 监听容器变化自动 fit
+  // ResizeObserver 监听容器变化自动 fit，并同步远端 PTY 尺寸。 // Logan.Li
   useEffect(() => {
     if (!open) return;
-    const container = containerRef.current;
-    if (!container) return;
-
-    let resizeTimer: ReturnType<typeof setTimeout>;
-    const ro = new ResizeObserver(() => {
-      clearTimeout(resizeTimer);
-      resizeTimer = setTimeout(() => {
-        if (fitRef.current && termRef.current && wsRef.current) {
-          try {
-            fitRef.current.fit();
-            termRef.current.focus();
-            const { cols, rows } = termRef.current;
-            if (wsRef.current.readyState === WebSocket.OPEN) {
-              wsRef.current.send(JSON.stringify({ status: 1, cols, rows }));
-            }
-          } catch { /* noop */ }
-        }
-      }, 60);
-    });
-
-    ro.observe(container);
-    return () => {
-      clearTimeout(resizeTimer);
-      ro.disconnect();
+    let cleanup: (() => void) | undefined;
+    let retry = 0;
+    const attach = () => {
+      const container = containerRef.current;
+      const fit = fitRef.current;
+      const term = termRef.current;
+      if (!container || !fit || !term) {
+        if (retry++ < 30) requestAnimationFrame(attach);
+        return;
+      }
+      cleanup = attachTerminalResize(container, fit, term, wsRef.current);
     };
-  }, [open]);
+    attach();
+    return () => cleanup?.();
+  }, [open, fullscreen]);
 
   return (
     <Dialog open={open} onOpenChange={onOpenChange}>
@@ -202,11 +187,10 @@ export function KubectlTerminal({ open, onOpenChange, clusterId, clusterName }:
         </div>
 
         {/* 终端容器 */}
-        <div
-          ref={containerRef}
-          className="bg-[#0f172a]"
-          style={{ height: fullscreen ? 'calc(100vh - 49px)' : '480px' }}
-        />
+        <div className="relative bg-[#0f172a]" style={{ height: fullscreen ? 'calc(100vh - 49px)' : '480px' }}>
+          <div ref={containerRef} className="xterm-terminal-host h-full" />
+          <TerminalLoadingOverlay show={!hasOutput && !error} label="正在连接集群..." />
+        </div>
       </DialogContent>
     </Dialog>
   );