perf: 加快拆分QA和生成向量；余额不足提醒

src/types/index.d.ts

@@ -4,7 +4,7 @@ import type { RedisClientType } from 'redis';
 declare global {
   var mongodb: Mongoose | string | null;
   var redisClient: RedisClientType | null;
-  var generatingQA: number;
+  var generatingQA: boolean;
   var generatingAbstract: boolean;
   var generatingVector: boolean;
   var QRCode: any;