refactor: add trailing comma to OpenAI client configuration

pdfzh_translator.py

@@ -63,7 +63,8 @@ class OpenAITranslator(BaseTranslator):
         self.options = {"temperature": 0}  # 随机采样可能会打断公式标记
         # Configure OpenAI client with environment variables
         self.client = openai.OpenAI(
-            api_key=os.getenv('OPENAI_API_KEY')
+            api_key=os.getenv('OPENAI_API_KEY'),
+            
         )
 
     def translate(self, text) -> str: