Fix: Complete lazy initialization for all service references

student/api.py

@@ -155,7 +155,7 @@ async def process_build_request(request: TaskRequest) -> None:
         # Notify evaluation endpoint
         logger.info(f"Notifying evaluation endpoint for {task_key}")
         active_tasks[task_key]["status"] = "notifying"
-        success = await notification_client.notify_with_timeout(
+        success = await get_notification_client().notify_with_timeout(
             request.evaluation_url,
             submission,
             timeout_minutes=settings.task_timeout_minutes,
@@ -193,7 +193,7 @@ async def process_update_request(request: TaskRequest) -> None:
             # If directory doesn't exist, treat as new build
             logger.warning(f"No existing code for {request.task}, creating new")
             output_dir.mkdir(parents=True, exist_ok=True)
-            code_generator.generate_app(request, output_dir)
+            get_code_generator().generate_app(request, output_dir)
         else:
             # Generate updated code
             logger.info(f"Updating code for {task_key}")
@@ -231,7 +231,7 @@ async def process_update_request(request: TaskRequest) -> None:
         # Notify evaluation endpoint
         logger.info(f"Notifying evaluation endpoint for {task_key}")
         active_tasks[task_key]["status"] = "notifying"
-        success = await notification_client.notify_with_timeout(
+        success = await get_notification_client().notify_with_timeout(
             request.evaluation_url,
             submission,
             timeout_minutes=settings.task_timeout_minutes,