Refactor code structure for improved readability and maintainability

app/core/services.py

@@ -0,0 +1,23 @@
+"""Global services container to avoid circular imports."""
+
+from app.services.scheduler import SchedulerService
+
+
+class AppServices:
+    """Container for application services."""
+
+    def __init__(self) -> None:
+        """Initialize the application services container."""
+        self.scheduler_service: SchedulerService | None = None
+
+
+# Global service container
+app_services = AppServices()
+
+
+def get_global_scheduler_service() -> SchedulerService:
+    """Get the global scheduler service instance."""
+    if app_services.scheduler_service is None:
+        msg = "Scheduler service not initialized"
+        raise RuntimeError(msg)
+    return app_services.scheduler_service