Add OS notification listener for Windows toast capture

Polls Windows notifications via winsdk UserNotificationListener API
and fires matching notification CSS streams with os_listener=True.
Includes history API endpoint for tracking captured notifications.

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

server/src/wled_controller/main.py

@@ -35,6 +35,7 @@ from wled_controller.core.automations.automation_engine import AutomationEngine
 from wled_controller.core.mqtt.mqtt_service import MQTTService
 from wled_controller.core.devices.mqtt_client import set_mqtt_service
 from wled_controller.core.backup.auto_backup import AutoBackupEngine
+from wled_controller.core.processing.os_notification_listener import OsNotificationListener
 from wled_controller.api.routes.system import STORE_MAP
 from wled_controller.utils import setup_logging, get_logger
 
@@ -188,6 +189,13 @@ async def lifespan(app: FastAPI):
     # Start auto-backup engine (periodic configuration backups)
     await auto_backup_engine.start()
 
+    # Start OS notification listener (Windows toast → notification CSS streams)
+    os_notif_listener = OsNotificationListener(
+        color_strip_store=color_strip_store,
+        color_strip_stream_manager=processor_manager.color_strip_stream_manager,
+    )
+    os_notif_listener.start()
+
     yield
 
     # Shutdown
@@ -206,6 +214,12 @@ async def lifespan(app: FastAPI):
     except Exception as e:
         logger.error(f"Error stopping automation engine: {e}")
 
+    # Stop OS notification listener
+    try:
+        os_notif_listener.stop()
+    except Exception as e:
+        logger.error(f"Error stopping OS notification listener: {e}")
+
     # Stop all processing
     try:
         await processor_manager.stop_all()