feat(search): add Baidu Qianfan AI Search provider with i18n docs

- Add BaiduSearchConfig struct and register in WebToolsConfig/defaults
- Insert Baidu Search in priority chain: DuckDuckGo > Baidu > GLM Search
- Use perplexityTimeout (30s) — Qianfan is LLM-based
- Fix response parsing: use references[] field per API spec
- Add baidu_search block to config.example.json

docs: sync configuration.md and README Documentation table across all languages

- Complete truncated configuration.md for fr/ja/pt-br/vi/zh: add Spawn
  async flow diagram, Providers table, Model Configuration (all vendors,
  examples, load balancing, migration), Provider Architecture, Scheduled
  Tasks, and Advanced Topics links
- Add Hooks/Steering/SubTurn entries to Documentation table in all 8
  READMEs (en/zh/fr/id/it/ja/pt-br/vi), ordered before Troubleshooting
- Add Baidu Search row to web search table in all 8 READMEs and
  tools_configuration.md (en + 5 i18n); zh README reorders search
  engines with China-friendly options first
- Add Matrix channel docs translations (fr/ja/pt-br/vi)
- Add Weixin channel to chat-apps.md and all README Channels tables

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

pkg/agent/loop.go

@@ -174,17 +174,21 @@ func registerSharedTools(
 					cfg.Tools.Web.Perplexity.APIKey,
 					cfg.Tools.Web.Perplexity.APIKeys,
 				),
-				PerplexityMaxResults: cfg.Tools.Web.Perplexity.MaxResults,
-				PerplexityEnabled:    cfg.Tools.Web.Perplexity.Enabled,
-				SearXNGBaseURL:       cfg.Tools.Web.SearXNG.BaseURL,
-				SearXNGMaxResults:    cfg.Tools.Web.SearXNG.MaxResults,
-				SearXNGEnabled:       cfg.Tools.Web.SearXNG.Enabled,
-				GLMSearchAPIKey:      cfg.Tools.Web.GLMSearch.APIKey,
-				GLMSearchBaseURL:     cfg.Tools.Web.GLMSearch.BaseURL,
-				GLMSearchEngine:      cfg.Tools.Web.GLMSearch.SearchEngine,
-				GLMSearchMaxResults:  cfg.Tools.Web.GLMSearch.MaxResults,
-				GLMSearchEnabled:     cfg.Tools.Web.GLMSearch.Enabled,
-				Proxy:                cfg.Tools.Web.Proxy,
+				PerplexityMaxResults:  cfg.Tools.Web.Perplexity.MaxResults,
+				PerplexityEnabled:     cfg.Tools.Web.Perplexity.Enabled,
+				SearXNGBaseURL:        cfg.Tools.Web.SearXNG.BaseURL,
+				SearXNGMaxResults:     cfg.Tools.Web.SearXNG.MaxResults,
+				SearXNGEnabled:        cfg.Tools.Web.SearXNG.Enabled,
+				GLMSearchAPIKey:       cfg.Tools.Web.GLMSearch.APIKey,
+				GLMSearchBaseURL:      cfg.Tools.Web.GLMSearch.BaseURL,
+				GLMSearchEngine:       cfg.Tools.Web.GLMSearch.SearchEngine,
+				GLMSearchMaxResults:   cfg.Tools.Web.GLMSearch.MaxResults,
+				GLMSearchEnabled:      cfg.Tools.Web.GLMSearch.Enabled,
+				BaiduSearchAPIKey:     cfg.Tools.Web.BaiduSearch.APIKey,
+				BaiduSearchBaseURL:    cfg.Tools.Web.BaiduSearch.BaseURL,
+				BaiduSearchMaxResults: cfg.Tools.Web.BaiduSearch.MaxResults,
+				BaiduSearchEnabled:    cfg.Tools.Web.BaiduSearch.Enabled,
+				Proxy:                 cfg.Tools.Web.Proxy,
 			})
 			if err != nil {
 				logger.ErrorCF("agent", "Failed to create web search tool", map[string]any{"error": err.Error()})