fix(api): 修正userId字段JSON键名

- 修改JSON_CONTAINS中字段键名由'user_id'为'userId'
- 保证用户ID匹配逻辑正确执行
- 防止因键名错误导致的查询失败

server/internal/api/ymt_merchants.go

@@ -36,7 +36,7 @@ func (a *YMTMerchantsAPI) list(w http.ResponseWriter, r *http.Request) {
 	args := []interface{}{}
 	if userIDStr != "" {
 		// user_id 匹配 或者 operation_user JSON 中包含该 user_id
-		sql1 += " AND (user_id = ? OR JSON_CONTAINS(operation_user, JSON_OBJECT('user_id', CAST(? AS SIGNED))))"
+		sql1 += " AND (user_id = ? OR JSON_CONTAINS(operation_user, JSON_OBJECT('userId', CAST(? AS SIGNED))))"
 		args = append(args, userIDStr, userIDStr)
 	}
 	if like != "" {