[Request] Recommend customizing Serper API base option

[NeverOccurs]

🥰 Feature Description

Recommend allowing users to customize Serper API base since there are other endpoints available.

🧐 Proposed Solution

add an environment variable in .env for users to config.

📝 Additional Information

No response

[lobehubbot]

👀 @NeverOccurs

Thank you for raising an issue. We will investigate into the matter and get back to you as soon as possible.
Please make sure you have given us as much context as possible.
非常感谢您提交 issue。我们会尽快调查此事，并尽快回复您。 请确保您已经提供了尽可能多的背景信息。

[arvinxx]

It seems the demand for the search plugin