feat: notification sending for printing order created

printing/apps.py

@@ -12,8 +12,9 @@ class PrintingConfig(AppConfig):
     def ready(self):
         """注册信号处理函数"""
         from stateflow.signals import process_completed, state_advanced
-        from .models import PrintingJob
+        from .models import PrintingJob, PrintingOrder
         from . import handlers
+        from .signals import printing_order_created
         
         # 监听 PrintingJob 流程完成信号
         process_completed.connect(
@@ -26,6 +27,13 @@ class PrintingConfig(AppConfig):
             handlers.on_printing_job_state_advanced,
             sender=PrintingJob
         )
+
+        # 监听 PrintingOrder 创建事件（领域 signal）
+        printing_order_created.connect(
+            handlers.on_printing_order_created,
+            sender=PrintingOrder,
+            dispatch_uid="printing.on_printing_order_created",
+        )
         
         logger.info(
             f'[printing.apps] 已注册 process_completed 信号处理器, '
@@ -34,4 +42,8 @@ class PrintingConfig(AppConfig):
         logger.info(
             f'[printing.apps] 已注册 state_advanced 信号处理器, '
             f'sender={PrintingJob}, handler={handlers.on_printing_job_state_advanced}'
+        )
+        logger.info(
+            f'[printing.apps] 已注册 printing_order_created 信号处理器, '
+            f'sender={PrintingOrder}, handler={handlers.on_printing_order_created}'
         )