feat: added print_count api, added merchant setting model, added manual mode setting for purchase order

basic_info/services.py

@@ -73,3 +73,9 @@ class DataVisibilityService:
             return False
 
         return basic_models.WareHouse.objects.filter(id=warehouse_id).filter(merchant=emp.merchant).exists()
+
+
+class MerchantSettingService:
+    @staticmethod
+    def get_setting(merchant: basic_models.Merchant, key: basic_models.MerchantSettingKeyEnum):
+        return basic_models.MerchantSetting.objects.get(merchant=merchant, key=key)