feat: sse && multi_merchant completed

sse/__init__.py

@@ -0,0 +1,19 @@
+from django.apps import AppConfig
+from . import services
+import signal, sys
+
+
+class SseConfig(AppConfig):
+    default_auto_field = 'django.db.models.BigAutoField'
+    name = 'sse'
+
+    def ready(self):
+        def cleanup_on_shutdown():
+            """在接收到终止信号时设置关闭事件"""
+            from .views import _shutdown_event
+            _shutdown_event.set()
+            services.cleanup_all_connections()
+            sys.exit(0)
+
+        signal.signal(signal.SIGINT, lambda s, f: cleanup_on_shutdown())
+        signal.signal(signal.SIGTERM, lambda s, f: cleanup_on_shutdown())