🔧 Fix all ruff typo errors & test CI/CD workflow (#109)

* [chore] Fix ruff typo

* [robot] Fix welcome robot

examples/client_demo.py

@@ -3,8 +3,8 @@ import requests
 server_url = "http://127.0.0.1:8000/predict"
 
 img_path = "/path/to/your/image"
-with open(img_path, 'rb') as img:
-    files = {'img': img}
+with open(img_path, "rb") as img:
+    files = {"img": img}
     response = requests.post(server_url, files=files)
 
 print(response.text)