[Feature Request]: Support for SearXNG search engine

[tiantangzhixia]

Self Checks

• I have searched for existing issues search for existing issues, including closed ones.
• I confirm that I am using English to submit this report (Language Policy).
• Non-english title submitions will be closed directly ( 非英文标题的提交将会被直接关闭 ) (Language Policy).
• Please do not modify this template :) and fill in all the required fields.

Is your feature request related to a problem?

Describe the feature you'd like

Currently there is Docker deployment of SearXNG search, which I hope to be able to use in RAGflow as a way to avoid the expense and consumption of search engine api's. I wonder if there could be plans for this?

Describe implementation you've considered

No response

Documentation, adoption, use case

Additional information

No response