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/mcp-client/src/interfaces.ts

@@ -0,0 +1,74 @@
+// Host dependency injection interfaces
+// The MCP client package uses these interfaces to decouple from host infrastructure.
+
+/** Logging interface */
+export interface Logger {
+  debug(message: string, ...args: unknown[]): void
+  info(message: string, ...args: unknown[]): void
+  warn(message: string, ...args: unknown[]): void
+  error(message: string, ...args: unknown[]): void
+}
+
+/** Analytics/telemetry callback */
+export interface AnalyticsSink {
+  trackEvent(event: string, metadata: Record<string, unknown>): void
+}
+
+/** Feature flag check */
+export interface FeatureGate {
+  isEnabled(flag: string): boolean
+}
+
+/** OAuth token provider */
+export interface AuthProvider {
+  getTokens(): Promise<{ accessToken: string } | null>
+  refreshTokens(): Promise<void>
+  handleOAuthError?(error: unknown): Promise<void>
+}
+
+/** HTTP/WebSocket proxy configuration */
+export interface ProxyConfig {
+  getFetchOptions?(): Record<string, unknown>
+  getWebSocketAgent?(url: string): unknown
+  getWebSocketUrl?(url: string): string | undefined
+  getTLSOptions?(): Record<string, unknown> | undefined
+}
+
+/** Binary/image content persistence */
+export interface ContentStorage {
+  persistBinaryContent(data: Buffer, ext: string): Promise<string>
+  persistToolResult?(toolUseId: string, content: unknown): Promise<void>
+}
+
+/** Image processing (resize, downsample) */
+export interface ImageProcessor {
+  resizeAndDownsample?(buffer: Buffer): Promise<Buffer>
+}
+
+/** HTTP configuration (user agent, session ID) */
+export interface HttpConfig {
+  getUserAgent(): string
+  getSessionId?(): string
+}
+
+/** Subprocess environment variable provider */
+export interface SubprocessEnvProvider {
+  getEnv(additional?: Record<string, string>): Record<string, string>
+}
+
+/**
+ * Complete set of host dependencies required by the MCP client.
+ * All fields except `logger` and `httpConfig` are optional —
+ * the client degrades gracefully when they're not provided.
+ */
+export interface McpClientDependencies {
+  logger: Logger
+  analytics?: AnalyticsSink
+  featureGate?: FeatureGate
+  auth?: AuthProvider
+  proxy?: ProxyConfig
+  storage?: ContentStorage
+  imageProcessor?: ImageProcessor
+  httpConfig: HttpConfig
+  subprocessEnv?: SubprocessEnvProvider
+}