feat(admin): unify system data management and aggregate import/export

frontend/src/api/admin.ts

@@ -91,6 +91,13 @@ export interface UsersExportData {
   standalone_keys?: StandaloneKeyExport[]
 }
 
+export interface AggregateExportData {
+  version: string
+  exported_at: string
+  config_data: ConfigExportData
+  user_data: UsersExportData
+}
+
 export interface UserGroupExport {
   id?: string
   name: string
@@ -421,6 +428,16 @@ export interface UsersImportResponse {
   }
 }
 
+export interface AggregateImportRequest extends AggregateExportData {
+  merge_mode: 'skip' | 'overwrite' | 'error'
+}
+
+export interface AggregateImportResponse {
+  message: string
+  config: ConfigImportResponse
+  users: UsersImportResponse
+}
+
 export interface ConfigImportResponse {
   message: string
   stats: {
@@ -837,6 +854,21 @@ export const adminApi = {
     return response.data
   },
 
+  // 导出聚合数据（配置数据 + 用户数据）
+  async exportAggregateData(): Promise<AggregateExportData> {
+    const response = await apiClient.get<AggregateExportData>('/api/admin/system/data/export')
+    return response.data
+  },
+
+  // 导入聚合数据（配置数据 + 用户数据）
+  async importAggregateData(data: AggregateImportRequest): Promise<AggregateImportResponse> {
+    const response = await apiClient.post<AggregateImportResponse>(
+      '/api/admin/system/data/import',
+      data
+    )
+    return response.data
+  },
+
   // 查询 Provider 可用模型（从上游 API 获取）
   async queryProviderModels(providerId: string, apiKeyId?: string, forceRefresh = false): Promise<ProviderModelsQueryResponse> {
     const response = await apiClient.post<ProviderModelsQueryResponse>(