fix some cython code

main.py

@@ -89,6 +89,7 @@ class DetectionEvent(BaseModel):
 class HealthResponse(BaseModel):
     status: str
     aiAvailability: str
+    engineType: Optional[str] = None
     errorMessage: Optional[str] = None
 
 
@@ -128,9 +129,11 @@ def health() -> HealthResponse:
         status = inf.ai_availability_status
         status_str = str(status).split()[0] if str(status).strip() else "None"
         error_msg = status.error_message if hasattr(status, 'error_message') else None
+        engine_type = inf.engine.engine_name if inf.engine is not None else None
         return HealthResponse(
             status="healthy",
             aiAvailability=status_str,
+            engineType=engine_type,
             errorMessage=error_msg,
         )
     except Exception: