feat(generate): 优化代码生成逻辑

- 新增公共字段配置，统一处理常见字段的生成规则
- 修复模板中的一些错误，如变量名、函数名等
- 优化代码结构，提高可读性和可维护性

templates/python/api.py.jinja

@@ -79,7 +79,7 @@ async def delete_{{ name }}_list(request: Request, params: DeleteListParams):
 async def update_{{ name }}(request: Request, params: Update{{ class_name }}Params, id: str = Path(description="{{ description }}ID")):
     if {{ name }} := await {{ class_name }}.get_or_none(id=id, del_flag=1):
         {% for column in columns if column.is_edit %}
-        {{ name }}.{{ column.python_name }} = params.{{ column.python_name }},
+        {{ name }}.{{ column.python_name }} = params.{{ column.python_name }}
         {% endfor %}
         await {{ name }}.save()
         return Response.success(msg="修改成功")