修复(#8): 分组管理核心缺陷与测试覆盖 (#11)

Co-authored-by: multica-agent <github@multica.ai>

internal/logic/admin/group/getGroupHistoryDetailLogic.go

@@ -76,16 +76,16 @@ func (l *GetGroupHistoryDetailLogic) GetGroupHistoryDetail(req *types.GetGroupHi
 		configSnapshot := make(map[string]interface{})
 		configSnapshot["group_details"] = details
 
-		// 获取配置快照（从 system_config 读取）
+		// 获取配置快照（从 system 读取）
 		var configValue string
 		if history.GroupMode == "average" {
-			l.svcCtx.DB.Table("system_config").
-				Where("`key` = ?", "group.average_config").
+			l.svcCtx.DB.Table("system").
+				Where("`category` = ? AND `key` = ?", "group", "average_config").
 				Select("value").
 				Scan(&configValue)
 		} else if history.GroupMode == "traffic" {
-			l.svcCtx.DB.Table("system_config").
-				Where("`key` = ?", "group.traffic_config").
+			l.svcCtx.DB.Table("system").
+				Where("`category` = ? AND `key` = ?", "group", "traffic_config").
 				Select("value").
 				Scan(&configValue)
 		}