Refactor USTariffFractionService to use async in get_all method and clean up redundant return statement

backend/api/v1/modules/a76/general_catalogs/fractions/tariff_fractions/service.py

@@ -137,7 +137,7 @@ class TariffFractionService:
             from api.v1.modules.a76.general_catalogs.fractions.us_tariff_fractions.service import USTariffFractionService
             
             # Use local service directly
-            usa_items, total = USTariffFractionService.get_all(
+            usa_items, total = await USTariffFractionService.get_all(
                 db, tenant_id, company_id, skip, limit, filters
             )
             

backend/api/v1/modules/a76/general_catalogs/fractions/us_tariff_fractions/service.py

@@ -131,9 +131,7 @@ class USTariffFractionService:
         total = query.count()
         items = query.order_by(USTariffFraction.code).offset(skip).limit(limit).all()
 
-        return items, total
-
-        return items, total
+        return items, total        
 
     @staticmethod
     def get_by_id(