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/server/TerminalDialog.tsx

@@ -12,11 +12,11 @@ import 'xterm/css/xterm.css';
 import { Maximize2, Minimize2, X, Shield} from 'lucide-react';
 import { cn } from '@/lib/utils';
 import { attachTerminalResize, fitTerminal, mountXterm } from '@/lib/xterm-utils';
+import { TerminalLoadingOverlay } from '@/components/common/TerminalLoadingOverlay';
 import { useUserStore } from '@/store';
 import { credentialApi, serverCredentialApi } from '@/api';
 import { toast } from 'sonner';
 import type { JsonData } from '@/types/common';
-import i18n from '@/i18n';
 
 interface TerminalDialogProps {
   open: boolean;
@@ -46,6 +46,7 @@ export function TerminalDialog({
   const fitRef = useRef<FitAddon | null>(null);
   const [connected, setConnected] = useState(false);
   const [fullscreen, setFullscreen] = useState(false);
+  const [hasOutput, setHasOutput] = useState(false);
 
   // 凭据选择状态（hasAuth=false 时显示） // Logan.Li
   const [credentials, setCredentials] = useState<JsonData[]>([]);
@@ -65,10 +66,10 @@ export function TerminalDialog({
     try {
       setAssigning(true);
       await serverCredentialApi.assign(serverId, Number(selectedCredId));
-      toast.success(i18n.t('server.terminaldialogt.s7c9109af'));
+      toast.success('凭据已关联');
       setAuthReady(true);
     } catch (e) {
-      toast.error(e?.message || i18n.t('server.terminaldialogt.s6d973dbe'));
+      toast.error(e?.message || '关联失败');
     } finally {
       setAssigning(false);
     }
@@ -85,6 +86,7 @@ export function TerminalDialog({
   // 连接终端（authReady=true 时才执行）
   useEffect(() => {
     if (!open || !serverId || !authReady) return;
+    setHasOutput(false);
 
     // 创建终端
     const term = new XTerm({
@@ -121,9 +123,11 @@ export function TerminalDialog({
       try {
         const msg = JSON.parse(event.data);
         if (msg.status === 0 && typeof msg.data === 'string') {
+          setHasOutput(true);
           term.write(msg.data);
         }
       } catch {
+        setHasOutput(true);
         term.write(typeof event.data === 'string' ? event.data : '');
       }
     };
@@ -136,11 +140,13 @@ export function TerminalDialog({
 
     ws.onclose = () => {
       setConnected(false);
-      term.write(i18n.t('server.terminaldialogt.safab2019'));
+      setHasOutput(true);
+      term.write('\r\n\x1b[31m[连接已关闭]\x1b[0m\r\n');
     };
 
     ws.onerror = () => {
-      term.write(i18n.t('kubernetes.podexecterminal.sc8107726'));
+      setHasOutput(true);
+      term.write('\r\n\x1b[31m[连接发生错误]\x1b[0m\r\n');
     };
 
     return () => {
@@ -227,11 +233,11 @@ export function TerminalDialog({
           <div className="p-6 flex flex-col items-center justify-center gap-4" style={{ height: '480px' }}>
             <Shield className="h-12 w-12 dg-text-yellow" />
             <div className="text-center">
-              <p className="text-[var(--dg-text-primary)] font-medium mb-1"> {i18n.t('server.terminaldialogt.sa8156f58')} </p>
-              <p className="text-sm text-[var(--dg-text-muted)]"> {i18n.t('server.terminaldialogt.s909c9a65')} </p>
+              <p className="text-[var(--dg-text-primary)] font-medium mb-1">服务器未配置认证凭据</p>
+              <p className="text-sm text-[var(--dg-text-muted)]">请选择一个凭据用于 SSH 连接</p>
             </div>
             {credentials.length === 0 ? (
-              <p className="text-xs text-[var(--dg-text-muted)]"> {i18n.t('server.terminaldialogt.s817bf0a2')} </p>
+              <p className="text-xs text-[var(--dg-text-muted)]">暂无可用凭据，请先去「凭证配置」添加</p>
             ) : (
               <select
                 value={selectedCredId}
@@ -251,17 +257,16 @@ export function TerminalDialog({
               disabled={!selectedCredId || assigning}
               className="bg-[var(--dg-blue)] hover:opacity-90 text-white"
             >
-              {assigning ? i18n.t('server.terminaldialogt.saf3d5dd8') : i18n.t('server.terminaldialogt.s9b448012')}
+              {assigning ? '关联中...' : '确认连接'}
             </Button>
           </div>
         )}
         {/* 终端容器 */}
         {authReady && (
-          <div
-            ref={containerRef}
-            className="xterm-terminal-host"
-            style={{ height: fullscreen ? 'calc(100vh - 49px)' : '520px' }}
-          />
+          <div className="relative bg-[#0a0e14]" style={{ height: fullscreen ? 'calc(100vh - 49px)' : '520px' }}>
+            <div ref={containerRef} className="xterm-terminal-host h-full" />
+            <TerminalLoadingOverlay show={!hasOutput} label="正在登录..." />
+          </div>
         )}
       </DialogContent>
     </Dialog>