后台：增加后台数据库表，修复连接问题

shared/db/GMUser.ts

@@ -1,7 +1,7 @@
 import { COUNTER } from './../consts';
 import { CounterModel } from './Counter';
 import BaseModel from './BaseModel';
-import { index, getModelForClass, prop, DocumentType, mongoose } from '@typegoose/typegoose';
+import { index, getModelForClass, prop, DocumentType, mongoose, ReturnModelType } from '@typegoose/typegoose';
 const bcrypt = require('bcrypt');
 const SALT_WORK_FACTOR = 5
 
@@ -85,7 +85,7 @@ export default class GMUser extends BaseModel {
     }
 }
 
-export let GMUserModel;
+export let GMUserModel: ReturnModelType<typeof GMUser, {}>;
 export function loadGMUserModel(connect: mongoose.Connection) {
     GMUserModel = getModelForClass(GMUser, {
         existingConnection: connect