feat: new module for daily settlement

settlement/signals.py

@@ -0,0 +1,12 @@
+"""日结模块信号定义"""
+from django.dispatch import Signal
+
+# 日结完成信号
+# 参数：
+#   merchant: Merchant 实例
+#   settlement_date: datetime.date
+#   status: 'success' / 'failed' / 'partial'
+#   modules: list[str] - 参与统计的模块列表
+#   errors: dict - 模块错误详情 {'module_name': 'error message'}
+#   task_id: str - Celery 任务ID
+daily_settlement_completed = Signal()