refactor(region):合并行政区划的Service和Repository。

repository/region.go

@@ -1,24 +0,0 @@
-package repository
-
-import (
-	"electricity_bill_calc/cache"
-	"electricity_bill_calc/global"
-	"electricity_bill_calc/model"
-)
-
-type _RegionRepository struct{}
-
-var RegionRepo _RegionRepository
-
-func (_RegionRepository) FetchRegion(code string) (*model.Region, error) {
-	cachedRegion, _ := cache.RetreiveData[model.Region]("region", code)
-	if cachedRegion != nil {
-		return cachedRegion, nil
-	}
-	region := new(model.Region)
-	has, err := global.DBConn.ID(code).NoAutoCondition().Get(region)
-	if has {
-		cache.CacheData(region, "region", code)
-	}
-	return _postProcessSingle(region, has, err)
-}