model support (gpt4o) in project. (#1760)

* Add the environment variable: OPEN_BROWSER

* Add configurable browser launching with custom arguments

- Update `config.py` to include options for specifying the browser and its arguments for opening URLs.
- Modify `main.py` to use the configured browser settings from `config.py` to launch the web page.
- Enhance `config_loader.py` to process path-like strings by expanding and normalizing paths, which supports the configuration improvements.

* Add support for the following models:

"gpt-4o", "gpt-4o-2024-05-13"

---------

Co-authored-by: binary-husky <qingxu.fu@outlook.com>

main.py

@@ -364,8 +364,9 @@ def main():
         def warm_up_mods(): time.sleep(6); warm_up_modules()
 
         threading.Thread(target=auto_updates, name="self-upgrade", daemon=True).start() # 查看自动更新
-        threading.Thread(target=open_browser, name="open-browser", daemon=True).start() # 打开浏览器页面
         threading.Thread(target=warm_up_mods, name="warm-up",      daemon=True).start() # 预热tiktoken模块
+        if get_conf('AUTO_OPEN_BROWSER'):
+            threading.Thread(target=open_browser, name="open-browser", daemon=True).start() # 打开浏览器页面
 
     # 运行一些异步任务：自动更新、打开浏览器页面、预热tiktoken模块
     run_delayed_tasks()