✨ feat(connection-package): 支持连接恢复包双模式加密导入导出

- 新增 v2 连接恢复包 appKey 与文件密码双模式加密链路
- 扩展前后端导入导出流程并兼容 v1 与 legacy 格式
- 修复无文件密码恢复包导入误弹密码框导致的流程阻塞

frontend/src/components/ConnectionPackagePasswordModal.tsx

@@ -1,16 +1,23 @@
 import React from 'react';
-import { Input, Modal, Typography } from 'antd';
+import { Checkbox, Input, Modal, Typography } from 'antd';
 
 const { Text } = Typography;
 
+type ConnectionPackagePasswordModalMode = 'import' | 'export';
+
 export interface ConnectionPackagePasswordModalProps {
   open: boolean;
   title: string;
+  mode?: ConnectionPackagePasswordModalMode;
+  includeSecrets?: boolean;
+  useFilePassword?: boolean;
   password: string;
   error?: string;
   confirmLoading?: boolean;
   confirmText?: string;
   cancelText?: string;
+  onIncludeSecretsChange?: (value: boolean) => void;
+  onUseFilePasswordChange?: (value: boolean) => void;
   onPasswordChange: (value: string) => void;
   onConfirm: () => void;
   onCancel: () => void;
@@ -19,15 +26,29 @@ export interface ConnectionPackagePasswordModalProps {
 export default function ConnectionPackagePasswordModal({
   open,
   title,
+  mode = 'import',
+  includeSecrets = true,
+  useFilePassword = false,
   password,
   error,
   confirmLoading,
   confirmText = '确认',
   cancelText = '取消',
+  onIncludeSecretsChange,
+  onUseFilePasswordChange,
   onPasswordChange,
   onConfirm,
   onCancel,
 }: ConnectionPackagePasswordModalProps) {
+  const isExportMode = mode === 'export';
+  const showFilePasswordInput = isExportMode ? useFilePassword : true;
+  const placeholder = isExportMode ? '请输入文件保护密码（可选）' : '请输入恢复包密码';
+  const helperText = !includeSecrets
+    ? '将仅导出连接配置，不包含密码。'
+    : (useFilePassword
+      ? '请通过单独渠道将密码告知接收方，不要和文件一起发送。'
+      : '密码已加密保护。如需通过公网传输，建议设置文件保护密码。');
+
   return (
     <Modal
       open={open}
@@ -40,12 +61,37 @@ export default function ConnectionPackagePasswordModal({
       destroyOnClose={false}
       maskClosable={false}
     >
-      <Input.Password
-        autoFocus
-        value={password}
-        placeholder="请输入恢复包密码"
-        onChange={(event) => onPasswordChange(event.target.value)}
-      />
+      {isExportMode ? (
+        <div style={{ display: 'flex', flexDirection: 'column', gap: 12 }}>
+          <Checkbox
+            checked={includeSecrets}
+            onChange={(event) => onIncludeSecretsChange?.(event.target.checked)}
+          >
+            导出连接密码
+          </Checkbox>
+          <Checkbox
+            checked={useFilePassword}
+            disabled={!includeSecrets}
+            onChange={(event) => onUseFilePasswordChange?.(event.target.checked)}
+          >
+            设置文件保护密码
+          </Checkbox>
+        </div>
+      ) : null}
+      {showFilePasswordInput ? (
+        <Input.Password
+          autoFocus
+          value={password}
+          placeholder={placeholder}
+          disabled={isExportMode && !useFilePassword}
+          onChange={(event) => onPasswordChange(event.target.value)}
+        />
+      ) : null}
+      {isExportMode ? (
+        <Text type={useFilePassword ? 'warning' : 'secondary'} style={{ display: 'block', marginTop: 8 }}>
+          {helperText}
+        </Text>
+      ) : null}
       {error ? (
         <Text type="danger" style={{ display: 'block', marginTop: 8 }}>
           {error}