Refactor code structure for improved readability and maintainability

app/main.py

@@ -9,6 +9,7 @@ from app.api import api_router
 from app.core.config import settings
 from app.core.database import get_session_factory, init_db
 from app.core.logging import get_logger, setup_logging
+from app.core.services import app_services
 from app.middleware.logging import LoggingMiddleware
 from app.services.extraction_processor import extraction_processor
 from app.services.player import (
@@ -19,22 +20,10 @@ from app.services.player import (
 from app.services.scheduler import SchedulerService
 from app.services.socket import socket_manager
 
-scheduler_service = None
-
-
-def get_global_scheduler_service() -> SchedulerService:
-    """Get the global scheduler service instance."""
-    global scheduler_service
-    if scheduler_service is None:
-        raise RuntimeError("Scheduler service not initialized")
-    return scheduler_service
-
 
 @asynccontextmanager
 async def lifespan(_app: FastAPI) -> AsyncGenerator[None]:
     """Application lifespan context manager for setup and teardown."""
-    global scheduler_service
-
     setup_logging()
     logger = get_logger(__name__)
     logger.info("Starting application")
@@ -53,20 +42,22 @@ async def lifespan(_app: FastAPI) -> AsyncGenerator[None]:
     # Start the scheduler service
     try:
         player_service = get_player_service()  # Get the initialized player service
-        scheduler_service = SchedulerService(get_session_factory(), player_service)
-        await scheduler_service.start()
+        app_services.scheduler_service = SchedulerService(
+            get_session_factory(), player_service,
+        )
+        await app_services.scheduler_service.start()
         logger.info("Enhanced scheduler service started")
     except Exception:
         logger.exception("Failed to start scheduler service - continuing without it")
-        scheduler_service = None
+        app_services.scheduler_service = None
 
     yield
 
     logger.info("Shutting down application")
 
     # Stop the scheduler service
-    if scheduler_service:
-        await scheduler_service.stop()
+    if app_services.scheduler_service:
+        await app_services.scheduler_service.stop()
         logger.info("Scheduler service stopped")
 
     # Stop the player service