Add health check endpoint

app.py

@@ -30,6 +30,10 @@ def update_job_status(job_id: str, state: str, detail: str = "", result: str = "
         "result": result
     }
 
+@app.get("/health")
+def health_check():
+    return {"status": "ok"}
+
 @app.post("/upload/")
 async def upload_image(background_tasks: BackgroundTasks, file: UploadFile = File(...)):
     # Basic validation