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/ImportCredentialSettings.tsx

@@ -0,0 +1,100 @@
+import { Input } from '@/components/ui/input';
+import type { Credential } from '@/components/deploy/credential-manager/types';
+
+interface ImportCredentialSettingsProps {
+  defaultSshPort: string;
+  onDefaultSshPortChange: (value: string) => void;
+  sshCredentials: Credential[];
+  rdpCredentials: Credential[];
+  selectedSshCredentialId: string;
+  selectedRdpCredentialId: string;
+  onSelectedSshCredentialIdChange: (value: string) => void;
+  onSelectedRdpCredentialIdChange: (value: string) => void;
+  compact?: boolean;
+}
+
+function credentialLabel(cred: Credential) {
+  return `${cred.name}${cred.summary ? ` · ${cred.summary}` : ''}`;
+}
+
+export function ImportCredentialSettings({
+  defaultSshPort,
+  onDefaultSshPortChange,
+  sshCredentials,
+  rdpCredentials,
+  selectedSshCredentialId,
+  selectedRdpCredentialId,
+  onSelectedSshCredentialIdChange,
+  onSelectedRdpCredentialIdChange,
+  compact = false,
+}: ImportCredentialSettingsProps) {
+  const labelClass = compact
+    ? 'block text-xs font-medium text-[var(--dg-text-secondary)] mb-1'
+    : 'block text-sm font-medium text-[var(--dg-text-secondary)] mb-2';
+  const panelClass = compact
+    ? 'grid grid-cols-1 sm:grid-cols-3 gap-4 p-4 rounded-lg bg-[var(--dg-bg-secondary)] border border-[var(--dg-border)]'
+    : 'grid grid-cols-1 md:grid-cols-3 gap-4';
+  const inputBg = compact ? 'bg-[var(--dg-bg-tertiary)]' : 'bg-[var(--dg-bg-secondary)]';
+
+  return (
+    <div className={panelClass}>
+      <div>
+        <label className={labelClass}>
+          SSH 端口
+          <span className="text-[var(--dg-text-muted)] ml-1">（Linux 默认）</span>
+        </label>
+        <Input
+          type="number"
+          placeholder="22"
+          value={defaultSshPort}
+          onChange={(e) => onDefaultSshPortChange(e.target.value)}
+          className={`w-32 ${inputBg} border-[var(--dg-border)] text-[var(--dg-text-primary)]`}
+        />
+      </div>
+      <div>
+        <label className={labelClass}>
+          Linux SSH 凭证
+          <span className="text-[var(--dg-text-muted)] ml-1">（可选）</span>
+        </label>
+        {sshCredentials.length === 0 ? (
+          <p className="text-xs text-[var(--dg-text-muted)] py-2">暂无 SSH 凭证</p>
+        ) : (
+          <select
+            value={selectedSshCredentialId}
+            onChange={(e) => onSelectedSshCredentialIdChange(e.target.value)}
+            className={`w-full px-3 py-2 ${inputBg} border border-[var(--dg-border)] rounded-md text-[var(--dg-text-primary)] text-sm`}
+          >
+            <option value="">不使用凭证</option>
+            {sshCredentials.map((cred) => (
+              <option key={cred.id} value={String(cred.id)}>
+                {credentialLabel(cred)}
+              </option>
+            ))}
+          </select>
+        )}
+      </div>
+      <div>
+        <label className={labelClass}>
+          Windows RDP 密码
+          <span className="text-[var(--dg-text-muted)] ml-1">（可选）</span>
+        </label>
+        {rdpCredentials.length === 0 ? (
+          <p className="text-xs text-[var(--dg-text-muted)] py-2">暂无 RDP 凭证</p>
+        ) : (
+          <select
+            value={selectedRdpCredentialId}
+            onChange={(e) => onSelectedRdpCredentialIdChange(e.target.value)}
+            className={`w-full px-3 py-2 ${inputBg} border border-[var(--dg-border)] rounded-md text-[var(--dg-text-primary)] text-sm`}
+          >
+            <option value="">不使用凭证</option>
+            {rdpCredentials.map((cred) => (
+              <option key={cred.id} value={String(cred.id)}>
+                {credentialLabel(cred)}
+              </option>
+            ))}
+          </select>
+        )}
+      </div>
+    </div>
+  );
+}