feat：新增单位字段返回

services/chart/line_equation/chart_info.go

@@ -29,6 +29,8 @@ type LineEquationDataResp struct {
 	ChartWidth          int
 	EdbName             string
 	EdbNameEn           string
+	Unit                string
+	UnitEn              string
 	IsAxis              int
 	DataList            []edbDataModel.EdbDataList
 }