docs: add Baidu Search connector setup guide

[jimmyzhuu]

Description

This PR re-raises the Baidu Search connector documentation changes against the dev branch, as requested in #1305.

It adds documentation for the Baidu Search connector and updates related documentation surfaces so users can discover and configure it correctly.

Baidu Search is already supported as a live search connector in SurfSense. This change documents how to get a Baidu AI Search / Qianfan AppBuilder API key, how the connector behaves, and how to troubleshoot common setup issues.

Changes

• Added a new Baidu Search connector guide:
  • surfsense_web/content/docs/connectors/baidu-search.mdx
• Added Baidu Search to the connectors documentation navigation:
  • surfsense_web/content/docs/connectors/meta.json
• Added a Baidu Search card to the connectors index page:
  • surfsense_web/content/docs/connectors/index.mdx
• Updated the Web Search guide to explain optional live search connectors:
  • SearXNG remains the bundled default search engine
  • Baidu Search, Tavily, and Linkup can be configured per search space
• Updated README external source lists to include Baidu Search alongside SearXNG, Tavily, and LinkUp.

Baidu API Reference

The new guide links to the Baidu AI Search product page and the API documentation that matches SurfSense's current backend integration:

• Product page: https://cloud.baidu.com/product/ai-search.html
• API reference: https://cloud.baidu.com/doc/qianfan/s/Omh4su4s0
• SurfSense endpoint used by the connector:
  • POST https://qianfan.baidubce.com/v2/ai_search/chat/completions

Why This Matters

Before this change, Baidu Search was available in the product but missing from the connector documentation. Users could see the connector in the UI, but there was no dedicated setup guide explaining:

• where to get the required API key
• how Baidu Search differs from indexed connectors
• when to use it for Chinese web search
• how to troubleshoot authentication, timeout, and relevance issues

Validation

• Ran git diff --check
• Verified the new connector page is included in connectors/meta.json
• Verified the connectors index links to /docs/connectors/baidu-search

I did not run the frontend build because surfsense_web/node_modules is not installed in this checkout.

High-level PR Summary

This PR adds comprehensive documentation for the Baidu Search connector, which is an existing feature in SurfSense that previously lacked setup documentation. The changes include a detailed connector setup guide explaining how to obtain and configure a Baidu Qianfan AppBuilder API key, when to use Baidu Search for Chinese web queries, and how to troubleshoot common issues. The connector is added to the documentation navigation and connectors index page, and README files across multiple languages are updated to list Baidu Search alongside other supported search engines. The Web Search guide is also updated to explain how optional live search connectors work in parallel with the bundled SearXNG engine.

⏱️ Estimated Review Time: 15-30 minutes

💡 Review Order Suggestion

Order	File Path
1	surfsense_web/content/docs/connectors/baidu-search.mdx
2	surfsense_web/content/docs/connectors/meta.json
3	surfsense_web/content/docs/connectors/index.mdx
4	surfsense_web/content/docs/how-to/web-search.mdx
5	README.md
6	README.zh-CN.md
7	README.es.md
8	README.pt-BR.md
9	README.hi.md

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