feat(log): 解耦用户访问日志存储，支持切换日志主库

用户访问日志可在 ClickHouse、PostgreSQL、SQLite 之间切换。
关闭 ClickHouse 时由主库承接写入与查询；切换任务会冻结写入、复制数据后翻转主库。
启动时校验日志主库与运行配置一致，定期清理按各库保留天数删除过期记录。

frontend/lib/services/admin/index.ts

@@ -29,6 +29,7 @@ export type {
   UpdateUserStatusRequest,
   UpdateUserRequest,
   SystemStatus,
+  LogDatabaseStatus,
   AppUpdateStatus,
   Schedule,
   CreateScheduleRequest,

frontend/lib/services/admin/status.service.ts

@@ -1,5 +1,5 @@
 import { BaseService } from '@/lib/services/core';
-import type { AppUpdateStatus, SystemStatus } from './types';
+import type { AppUpdateStatus, LogDatabaseStatus, SystemStatus } from './types';
 
 export class AdminStatusService extends BaseService {
   protected static readonly basePath = '/api/v1/admin';
@@ -8,6 +8,10 @@ export class AdminStatusService extends BaseService {
     return this.get<SystemStatus>('/status');
   }
 
+  static async getLogDatabaseStatus(): Promise<LogDatabaseStatus> {
+    return this.get<LogDatabaseStatus>('/status/log-database');
+  }
+
   static async getUpdateStatus(): Promise<AppUpdateStatus> {
     return this.get<AppUpdateStatus>('/update');
   }

frontend/lib/services/admin/types.ts

@@ -401,6 +401,20 @@ export interface ToggleAuthSourceRequest {
   is_active: boolean;
 }
 
+/**
+ * 日志数据库状态
+ */
+export interface LogDatabaseStatus {
+  /** 当前日志主库：postgres | sqlite | clickhouse */
+  active_database: string;
+  /** 迁移状态：idle | migrating */
+  migration: string;
+  /** 各日志库保留天数 */
+  retention_days: Record<string, number>;
+  /** 当前主库的合法迁移目标 */
+  available_targets: string[];
+}
+
 /**
  * 系统状态信息
  */

frontend/lib/services/index.ts

@@ -124,6 +124,7 @@ export type {
   CreateUserRequest,
   UpdateUserRequest,
   SystemStatus,
+  LogDatabaseStatus,
   AppUpdateStatus,
   Schedule,
   CreateScheduleRequest,