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

api_v1/enums.py

@@ -0,0 +1,11 @@
+from django.db import models
+
+
+class PrintCountObjectType(models.TextChoices):
+    PRINTING_ORDER = 'printing_order', '印染订单'
+    PLATE_ORDER = 'plate_order', '开版订单'
+
+    @classmethod
+    def values(cls):
+        return [choice.value for choice in cls]
+