feat: 重构 WebSearch/WebFetch，新增 Tavily 适配器及 /web-tools 面板

- WebSearch: 默认 Tavily，适配器优先级 WEB_SEARCH_ADAPTER > settings.webSearchAdapter > tavily
- WebFetch: 支持 Tavily /extract 返回 Markdown，移除 domain blacklist 远程检查
- 新增 /web-tools 命令面板（Search/Fetch 双 Tab + 二级配置菜单）
- 新增 settings 字段: webSearchAdapter, webFetchAdapter, tavilyEndpointUrl, braveApiKey, exaApiKey, exaEndpointUrl, webFetchHttpTimeoutMs
- 适配器联动: Tavily/Exa 从 settings 读取 endpoint 和 API key

Co-Authored-By: deepseek-v4-pro <deepseek-ai@claude-code-best.win>

packages/builtin-tools/src/tools/WebSearchTool/adapters/index.ts

@@ -1,13 +1,18 @@
 /**
- * Search adapter factory — selects the appropriate backend by checking
- * whether the API base URL points to Anthropic's official endpoint.
+ * Search adapter factory — selects the appropriate backend.
+ *
+ * Priority (highest first):
+ *   1. WEB_SEARCH_ADAPTER environment variable (explicit override)
+ *   2. settings.webSearchAdapter (user-configurable via /web-tools)
+ *   3. Default: tavily
  */
 
-import { isFirstPartyAnthropicBaseUrl } from 'src/utils/model/providers.js'
+import { getSettings_DEPRECATED } from 'src/utils/settings/settings.js'
 import { ApiSearchAdapter } from './apiAdapter.js'
 import { BingSearchAdapter } from './bingAdapter.js'
 import { BraveSearchAdapter } from './braveAdapter.js'
 import { ExaSearchAdapter } from './exaAdapter.js'
+import { TavilySearchAdapter } from './tavilyAdapter.js'
 import type { WebSearchAdapter } from './types.js'
 
 export type {
@@ -17,60 +22,53 @@ export type {
   WebSearchAdapter,
 } from './types.js'
 
-/**
- * Check if the current session uses a third-party (non-Anthropic) API provider.
- * These providers don't support Anthropic's server_tools (server-side web search),
- * so they must fall back to the Bing scraper adapter.
- */
-function isThirdPartyProvider(): boolean {
-  return !!(
-    process.env.CLAUDE_CODE_USE_OPENAI ||
-    process.env.CLAUDE_CODE_USE_GEMINI ||
-    process.env.CLAUDE_CODE_USE_GROK
-  )
-}
+export type SearchAdapterKey = 'api' | 'bing' | 'brave' | 'exa' | 'tavily'
 
 let cachedAdapter: WebSearchAdapter | null = null
-let cachedAdapterKey: 'api' | 'bing' | 'brave' | 'exa' | null = null
+let cachedAdapterKey: SearchAdapterKey | null = null
 
 export function createAdapter(): WebSearchAdapter {
+  // 1. Explicit env override
   const envAdapter = process.env.WEB_SEARCH_ADAPTER
-  // Priority:
-  //   1. Explicit env override (WEB_SEARCH_ADAPTER=api|bing|brave)
-  //   2. Third-party provider (OpenAI/Gemini/Grok) → bing (no server_tools support)
-  //   3. First-party Anthropic API → api (server-side web search + connector_text)
-  //   4. Fallback → bing
-  const adapterKey =
+  // 2. Settings preference (set via /web-tools panel)
+  const settingsAdapter = getSettings_DEPRECATED().webSearchAdapter
+
+  const adapterKey: SearchAdapterKey =
     envAdapter === 'api' ||
     envAdapter === 'bing' ||
     envAdapter === 'brave' ||
-    envAdapter === 'exa'
+    envAdapter === 'exa' ||
+    envAdapter === 'tavily'
       ? envAdapter
-      : isThirdPartyProvider()
-        ? 'bing'
-        : isFirstPartyAnthropicBaseUrl()
-          ? 'api'
-          : 'exa'
+      : settingsAdapter === 'api' ||
+          settingsAdapter === 'bing' ||
+          settingsAdapter === 'brave' ||
+          settingsAdapter === 'exa' ||
+          settingsAdapter === 'tavily'
+        ? settingsAdapter
+        : 'tavily' // 3. Default
 
   if (cachedAdapter && cachedAdapterKey === adapterKey) return cachedAdapter
 
-  if (adapterKey === 'api') {
-    cachedAdapter = new ApiSearchAdapter()
-    cachedAdapterKey = 'api'
-    return cachedAdapter
-  }
-  if (adapterKey === 'brave') {
-    cachedAdapter = new BraveSearchAdapter()
-    cachedAdapterKey = 'brave'
-    return cachedAdapter
-  }
-  if (adapterKey === 'exa') {
-    cachedAdapter = new ExaSearchAdapter()
-    cachedAdapterKey = 'exa'
-    return cachedAdapter
+  switch (adapterKey) {
+    case 'api':
+      cachedAdapter = new ApiSearchAdapter()
+      break
+    case 'bing':
+      cachedAdapter = new BingSearchAdapter()
+      break
+    case 'brave':
+      cachedAdapter = new BraveSearchAdapter()
+      break
+    case 'exa':
+      cachedAdapter = new ExaSearchAdapter()
+      break
+    case 'tavily':
+    default:
+      cachedAdapter = new TavilySearchAdapter()
+      break
   }
 
-  cachedAdapter = new BingSearchAdapter()
-  cachedAdapterKey = 'bing'
+  cachedAdapterKey = adapterKey
   return cachedAdapter
 }