feat: 工具层及 mcp 大重构 (#252)

* feat: 第一版大重构

* fix: 修复类型问题

* chore: 更新版本到 1.3.2

* Add brave as alternative WebSearchTool

* fix: 修正顺序

* fix: 修复对穷鬼模式的 auto dream 和 session memory 越过

* feat: 穷鬼模式去除 session-summary

* feat: 创建 builtin-tools 包，搬运所有工具实现

将 src/tools/ 下的全部 60 个工具目录迁移至 packages/builtin-tools/src/tools/，
内部导入路径已更新为 src/ alias 模式。

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

* refactor: 更新 src/ 中所有工具引用至 builtin-tools 包，删除 src/tools/

- src/tools.ts 及 178 个 src/ 文件的 import 路径从 ./tools/ 改为 builtin-tools/tools/
- 删除 src/tools/ 整个目录（已迁移至 packages/builtin-tools/）

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

* chore: 添加 builtin-tools 路径别名至 tsconfig，更新 bun.lock

- tsconfig.json 新增 builtin-tools/* 和 builtin-tools 路径映射
- 新增 packages/builtin-tools/src 至 include

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

* refactor: 为 builtin-tools、mcp-client、agent-tools 添加 @claude-code-best 作用域前缀

所有包名及 import 路径统一添加 @claude-code-best/ 前缀：
- builtin-tools → @claude-code-best/builtin-tools
- mcp-client → @claude-code-best/mcp-client
- agent-tools → @claude-code-best/agent-tools

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

* fix: 修复 node 环境没有 bun 的问题

---------

Co-authored-by: Eric-Guo <eric.guocz@gmail.com>
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

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

@@ -0,0 +1,47 @@
+/**
+ * Search adapter factory — selects the appropriate backend by checking
+ * whether the API base URL points to Anthropic's official endpoint.
+ */
+
+import { isFirstPartyAnthropicBaseUrl } from 'src/utils/model/providers.js'
+import { ApiSearchAdapter } from './apiAdapter.js'
+import { BingSearchAdapter } from './bingAdapter.js'
+import { BraveSearchAdapter } from './braveAdapter.js'
+import type { WebSearchAdapter } from './types.js'
+
+export type {
+  SearchResult,
+  SearchOptions,
+  SearchProgress,
+  WebSearchAdapter,
+} from './types.js'
+
+let cachedAdapter: WebSearchAdapter | null = null
+let cachedAdapterKey: 'api' | 'bing' | 'brave' | null = null
+
+export function createAdapter(): WebSearchAdapter {
+  const envAdapter = process.env.WEB_SEARCH_ADAPTER
+  const adapterKey =
+    envAdapter === 'api' || envAdapter === 'bing' || envAdapter === 'brave'
+      ? envAdapter
+      : isFirstPartyAnthropicBaseUrl()
+        ? 'api'
+        : 'bing'
+
+  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
+  }
+
+  cachedAdapter = new BingSearchAdapter()
+  cachedAdapterKey = 'bing'
+  return cachedAdapter
+}