✨ feat(query): 支持多条SQL语句执行返回多结果集

- 新增 ResultSetData 结构体承载单个结果集数据
- 新增 MultiResultQuerier/MultiResultQuerierContext 可选接口
- 新增 scanMultiRows 函数利用 NextResultSet() 遍历所有结果集
- MySQL 驱动 DSN 开启 multiStatements=true 并实现多结果集接口
- 新增 DBQueryMulti Wails 方法，支持驱动原生多结果集及自动回退逐条执行
- 新增 Go 版 SQL 拆分函数 splitSQLStatements 及 10 个单元测试
- 前端 QueryEditor handleRun 改为一次性调用 DBQueryMulti
- MongoDB 保持独立的逐条执行路径不受影响
- refs #235

frontend/wailsjs/go/app/App.d.ts

@@ -41,6 +41,8 @@ export function DBQuery(arg1:connection.ConnectionConfig,arg2:string,arg3:string
 
 export function DBQueryIsolated(arg1:connection.ConnectionConfig,arg2:string,arg3:string):Promise<connection.QueryResult>;
 
+export function DBQueryMulti(arg1:connection.ConnectionConfig,arg2:string,arg3:string,arg4:string):Promise<connection.QueryResult>;
+
 export function DBQueryWithCancel(arg1:connection.ConnectionConfig,arg2:string,arg3:string,arg4:string):Promise<connection.QueryResult>;
 
 export function DBShowCreateTable(arg1:connection.ConnectionConfig,arg2:string,arg3:string):Promise<connection.QueryResult>;

frontend/wailsjs/go/app/App.js

@@ -74,6 +74,10 @@ export function DBQueryIsolated(arg1, arg2, arg3) {
   return window['go']['app']['App']['DBQueryIsolated'](arg1, arg2, arg3);
 }
 
+export function DBQueryMulti(arg1, arg2, arg3, arg4) {
+  return window['go']['app']['App']['DBQueryMulti'](arg1, arg2, arg3, arg4);
+}
+
 export function DBQueryWithCancel(arg1, arg2, arg3, arg4) {
   return window['go']['app']['App']['DBQueryWithCancel'](arg1, arg2, arg3, arg4);
 }