系统：停服维护逻辑

web-server/app.ts

@@ -27,6 +27,8 @@ export default class FooBoot implements IBoot {
   async willReady() {
     // All plugins have started, can do some thing before app ready.
     // await this.customLoadModel();
+    const ctx = await this.app.createAnonymousContext();
+    await ctx.service.game.readDbMaintenance();
   }
 
   async didReady() {