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/ServerManager.tsx

@@ -47,6 +47,7 @@ import { toast } from 'sonner';
 import { useUserStore } from '@/store';
 import { CloudServerImport } from './CloudServerImport';
 import { TerminalDialog } from './TerminalDialog';
+import { RdpDialog } from './RdpDialog';
 import { ServerFileBrowser } from './ServerFileBrowser';
 import type { JsonData } from '@/types/common';
 import { ExcelServerImport } from './ExcelServerImport';
@@ -79,6 +80,8 @@ export function ServerManager() {
   // 终端 Dialog 状态
   const [terminalOpen, setTerminalOpen] = useState(false);
   const [terminalServer, setTerminalServer] = useState<{ id: number; name: string; ip: string; hasAuth?: boolean } | null>(null);
+  const [rdpOpen, setRdpOpen] = useState(false);
+  const [rdpServer, setRdpServer] = useState<{ id: number; name: string; ip: string } | null>(null);
 
   // 文件浏览 Dialog 状态
   const [fileBrowserOpen, setFileBrowserOpen] = useState(false);
@@ -105,6 +108,11 @@ export function ServerManager() {
     setTerminalOpen(true);
   };
 
+  const openRdp = (server: JsonData) => {
+    setRdpServer({ id: server.id, name: server.hostname, ip: server.ip });
+    setRdpOpen(true);
+  };
+
   const openFileBrowser = (server: JsonData) => {
     setFileBrowserServer({ id: server.id, name: server.hostname });
     setFileBrowserOpen(true);
@@ -272,6 +280,9 @@ export function ServerManager() {
       port: String(server.port || 22),
       username: server.username || 'root',
       auth_type: server.auth_type || 'password',
+      os_type: server.os_type || ((server.protocol === 'rdp') ? 'windows' : 'linux'),
+      protocol: server.protocol || ((server.os_type === 'windows') ? 'rdp' : 'ssh'),
+      rdp_port: String(server.rdp_port || 3389),
       password: '',
       ssh_key: '',
       credential_id: null as number | null,
@@ -297,6 +308,9 @@ export function ServerManager() {
         ip: formData.ip,
         public_ip: formData.public_ip || undefined,
         port: Number(formData.port) || 22,
+        os_type: formData.os_type || 'linux',
+        protocol: formData.protocol || 'ssh',
+        rdp_port: Number(formData.rdp_port) || 3389,
         username: formData.username || 'root',
         auth_type: formData.auth_type || 'password',
         os: formData.os,
@@ -500,6 +514,7 @@ export function ServerManager() {
                       selected={selectedServers.includes(String(server.id))}
                       onToggleSelect={toggleSelect}
                       onOpenTerminal={openTerminal}
+                      onOpenRdp={openRdp}
                       onOpenFiles={openFileBrowser}
                       onOpenEdit={openEditForm}
                       onDelete={handleDelete}
@@ -565,6 +580,13 @@ export function ServerManager() {
         onSave={handleSave}
         formSaving={formSaving}
       />
+      <RdpDialog
+        open={rdpOpen}
+        onOpenChange={setRdpOpen}
+        serverId={rdpServer?.id ?? null}
+        serverName={rdpServer?.name || ''}
+        serverIp={rdpServer?.ip || ''}
+      />
 
       {/* Import Dialogs */}
       <CloudServerImport