feat：添加日志功能

src/dto/admin_response.dto.ts

@@ -137,3 +137,28 @@ export class AdminCommonResponseDto {
   @ApiProperty({ required: false, example: 'ADMIN_OPERATION_FAILED' })
   error_code?: string;
 }
+
+class AdminRuntimeLogsDataDto {
+  @ApiProperty({ example: 'dev.log' })
+  file: string;
+
+  @ApiProperty({ description: '日志文件最后更新时间（ISO）', example: '2025-12-19T19:10:15.000Z' })
+  updated_at: string;
+
+  @ApiProperty({ type: [String], description: '日志行（按时间顺序，越靠后越新）' })
+  lines: string[];
+}
+
+export class AdminRuntimeLogsResponseDto {
+  @ApiProperty({ example: true })
+  success: boolean;
+
+  @ApiProperty({ type: AdminRuntimeLogsDataDto, required: false })
+  data?: AdminRuntimeLogsDataDto;
+
+  @ApiProperty({ example: '运行日志获取成功' })
+  message: string;
+
+  @ApiProperty({ required: false, example: 'ADMIN_OPERATION_FAILED' })
+  error_code?: string;
+}