✨ feat: support application search with searchXNG

[arvinxx]

💻 变更类型 | Change Type

• ✨ feat
• 🐛 fix
• ♻️ refactor
• 💄 style
• 👷 build
• ⚡️ perf
• 📝 docs
• 🔨 chore

🔀 变更说明 | Description of Change

配置环境变量： SEARXNG_URL

• close [Bug] Gemini 模型内置搜索引擎开关未限制本模型 #6477
• fix [Request] hope support searxng live searching #5703
• fix [Bug] GitHub GPT-4o failed due to "enabledSearch" #6478

📝 补充信息 | Additional Information

• [RFC] 087 - 应用级联网搜索功能 #6447

Zeabur 上有一键启动模板：https://zeabur.com/templates/77FSH6

[vercel]

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[lobehubbot]

👍 @arvinxx

Thank you for raising your pull request and contributing to our Community
Please make sure you have followed our contributing guidelines. We will review it as soon as possible.
If you encounter any problems, please feel free to connect with us.
非常感谢您提出拉取请求并为我们的社区做出贡献，请确保您已经遵循了我们的贡献指南，我们会尽快审查它。
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[codecov]

Codecov Report

Attention: Patch coverage is 88.03419% with 140 lines in your changes missing coverage. Please review.

Project coverage is 91.49%. Comparing base (3f9498e) to head (b95dcde).
Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
src/store/chat/slices/builtinTool/action.ts	28.09%	87 Missing ⚠️
src/server/modules/SearXNG.ts	42.42%	19 Missing ⚠️
src/server/routers/tools/search.ts	76.31%	9 Missing ⚠️
src/libs/trpc/client/tools.ts	75.00%	5 Missing ⚠️
src/services/message/server.ts	20.00%	4 Missing ⚠️
src/store/aiInfra/slices/aiModel/selectors.ts	75.00%	3 Missing ⚠️
src/store/chat/slices/message/action.ts	72.72%	3 Missing ⚠️
src/services/chat.ts	93.54%	2 Missing ⚠️
src/services/message/_deprecated.ts	50.00%	2 Missing ⚠️
src/services/message/client.ts	50.00%	2 Missing ⚠️
... and 2 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6452      +/-   ##
==========================================
- Coverage   91.54%   91.49%   -0.05%     
==========================================
  Files         690      697       +7     
  Lines       63998    65128    +1130     
  Branches     4389     4400      +11     
==========================================
+ Hits        58587    59590    +1003     
- Misses       5411     5538     +127     

Flag	Coverage Δ
app	91.49% <88.03%> (-0.05%)	⬇️
server	97.57% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

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[lobehubbot]

❤️ Great PR @arvinxx ❤️

The growth of project is inseparable from user feedback and contribution, thanks for your contribution! If you are interesting with the lobehub developer community, please join our discord and then dm @arvinxx or @canisminor1990. They will invite you to our private developer channel. We are talking about the lobe-chat development or sharing ai newsletter around the world.
项目的成长离不开用户反馈和贡献，感谢您的贡献! 如果您对 LobeHub 开发者社区感兴趣，请加入我们的 discord，然后私信 @arvinxx 或 @canisminor1990。他们会邀请您加入我们的私密开发者频道。我们将会讨论关于 Lobe Chat 的开发，分享和讨论全球范围内的 AI 消息。

[lobehubbot]

🎉 This PR is included in version 1.64.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot 📦🚀

[lobehubbot]

Bot detected the issue body's language is not English, translate it automatically. 👯👭🏻🧑‍🤝‍🧑👫🧑🏿‍🤝‍🧑🏻👩🏾‍🤝‍👨🏿👬🏿

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After SEARXNG_URL=XXX is configured, no return will be made after the search is triggered, and the return result will be empty