feat: 配置导出/导入支持 LDAP 和 OAuth Provider

- 新增配置格式 v2.1，支持导出/导入 LDAP 配置和 OAuth Providers
- 导出时解密敏感字段（bind_password, client_secret, provider_ops credentials）
- 导入时加密敏感字段后存储
- 前端支持预览和显示 LDAP/OAuth 导入结果

frontend/src/api/admin.ts

@@ -1,11 +1,46 @@
 import apiClient from './client'
 
+// LDAP 配置导出结构
+export interface LDAPConfigExport {
+  server_url: string
+  bind_dn: string
+  bind_password?: string
+  base_dn: string
+  user_search_filter?: string
+  username_attr?: string
+  email_attr?: string
+  display_name_attr?: string
+  is_enabled?: boolean
+  is_exclusive?: boolean
+  use_starttls?: boolean
+  connect_timeout?: number
+}
+
+// OAuth Provider 导出结构
+export interface OAuthProviderExport {
+  provider_type: string
+  display_name: string
+  client_id: string
+  client_secret?: string
+  authorization_url_override?: string | null
+  token_url_override?: string | null
+  userinfo_url_override?: string | null
+  scopes?: string[] | null
+  redirect_uri: string
+  frontend_callback_url: string
+  attribute_mapping?: any
+  extra_config?: any
+  is_enabled?: boolean
+}
+
 // 配置导出数据结构
 export interface ConfigExportData {
   version: string
   exported_at: string
   global_models: GlobalModelExport[]
   providers: ProviderExport[]
+  ldap_config?: LDAPConfigExport | null
+  oauth_providers?: OAuthProviderExport[]
 }
 
 // 用户导出数据结构
@@ -254,6 +289,8 @@ export interface ConfigImportResponse {
     endpoints: { created: number; updated: number; skipped: number }
     keys: { created: number; updated: number; skipped: number }
     models: { created: number; updated: number; skipped: number }
+    ldap?: { created: number; updated: number; skipped: number }
+    oauth?: { created: number; updated: number; skipped: number }
     errors: string[]
   }
 }

frontend/src/views/admin/SystemSettings.vue

@@ -538,6 +538,10 @@
             <li>
               API Keys: {{ importPreview.providers?.reduce((sum: number, p: any) => sum + (p.api_keys?.length || 0), 0) }} 个
             </li>
+            <li v-if="importPreview.ldap_config">LDAP 配置: 1 个</li>
+            <li v-if="importPreview.oauth_providers?.length">
+              OAuth Providers: {{ importPreview.oauth_providers.length }} 个
+            </li>
           </ul>
         </div>
 
@@ -655,6 +659,26 @@
               跳过: {{ importResult.stats.models.skipped }}
             </p>
           </div>
+          <div v-if="importResult.stats.ldap">
+            <p class="font-medium">
+              LDAP 配置
+            </p>
+            <p class="text-muted-foreground">
+              创建: {{ importResult.stats.ldap.created }},
+              更新: {{ importResult.stats.ldap.updated }},
+              跳过: {{ importResult.stats.ldap.skipped }}
+            </p>
+          </div>
+          <div v-if="importResult.stats.oauth">
+            <p class="font-medium">
+              OAuth Providers
+            </p>
+            <p class="text-muted-foreground">
+              创建: {{ importResult.stats.oauth.created }},
+              更新: {{ importResult.stats.oauth.updated }},
+              跳过: {{ importResult.stats.oauth.skipped }}
+            </p>
+          </div>
         </div>
 
         <div
@@ -1293,8 +1317,8 @@ function handleConfigFileSelect(event: Event) {
       const content = e.target?.result as string
       const data = JSON.parse(content) as ConfigExportData
 
-      // 验证版本
-      if (data.version !== '2.0') {
+      // 验证版本（支持 2.0 和 2.1）
+      if (!['2.0', '2.1'].includes(data.version)) {
         error(`不支持的配置版本: ${data.version}`)
         return
       }