Document in-app browser search provider

docs/src/content/docs/en/configuration/fusion-web-search.md

@@ -11,7 +11,20 @@ Use `ccr-fusion-builtins / web_search`.
 
 ## Search Providers
 
-Supported providers include Brave, Bing, Google CSE, Serper, SerpAPI, Tavily, and Exa.
+Supported providers include In-app Browser, Brave, Bing, Google CSE, Serper, SerpAPI, Tavily, and Exa.
+
+## In-app Browser
+
+`In-app Browser` runs searches through a hidden built-in browser window in CCR Desktop, opens result pages, extracts visible content, and passes that evidence to the Fusion model. It does not require an external search API key, so it is useful when you want desktop-side browser retrieval.
+
+Configuration options include search engine, language, country or region, and safe-search level:
+
+- Search engine: Bing, Google, or DuckDuckGo.
+- Language: for example `en` or `zh-CN`.
+- Country or region: for example `US` or `CN`.
+- Safe search: default, moderate, strict, or off.
+
+> Note: `In-app Browser` depends on CCR Desktop's Electron built-in browser capability and is only available in the desktop app. CLI, server deployments, and pure web environments do not have the built-in browser integration; use Brave, Bing, Google CSE, Serper, SerpAPI, Tavily, or Exa instead.
 
 ## Troubleshooting
 

docs/src/content/docs/zh/configuration/fusion-web-search.md

@@ -11,7 +11,20 @@ lead: 使用 CCR 内置 Web Search 工具为模型提供联网检索能力。
 
 ## 搜索服务
 
-支持 Brave、Bing、Google CSE、Serper、SerpAPI、Tavily、Exa 等搜索服务。
+支持 In-app Browser、Brave、Bing、Google CSE、Serper、SerpAPI、Tavily、Exa 等搜索服务。
+
+## In-app Browser
+
+`In-app Browser` 会通过 CCR Desktop 的隐藏内置浏览器窗口执行搜索，打开搜索结果页面并提取可见内容，再把证据提供给 Fusion 模型。它不需要外部搜索 API Key，适合希望用桌面端内置浏览器完成联网检索的场景。
+
+可配置项包括搜索引擎、语言、地区和安全搜索级别：
+
+- 搜索引擎：Bing、Google、DuckDuckGo。
+- 语言：例如 `en`、`zh-CN`。
+- 地区：例如 `US`、`CN`。
+- 安全搜索：默认、中等、严格或关闭。
+
+> 注意：`In-app Browser` 依赖 CCR Desktop 的 Electron 内置浏览器能力，只在桌面端可用。CLI、服务器部署或纯 Web 环境没有内置浏览器集成，请改用 Brave、Bing、Google CSE、Serper、SerpAPI、Tavily 或 Exa 等搜索服务。
 
 ## 排查要点