Skip event processor in standalone mode (no DB for LISTEN/NOTIFY)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

shared/infrastructure/factory.py

@@ -366,7 +366,7 @@ def create_base_app(
             return await base_context()
 
     # --- event processor ---
-    _event_processor = EventProcessor(app_name=name)
+    _event_processor = None if no_db else EventProcessor(app_name=name)
 
     # --- startup ---
     @app.before_serving
@@ -375,11 +375,13 @@ def create_base_app(
         register_shared_handlers()
         await init_config()
         print(pretty())
-        await _event_processor.start()
+        if _event_processor:
+            await _event_processor.start()
 
     @app.after_serving
     async def _stop_event_processor():
-        await _event_processor.stop()
+        if _event_processor:
+            await _event_processor.stop()
         from shared.infrastructure.auth_redis import close_auth_redis
         await close_auth_redis()