refactor: 将 weixin 模块从 src/ 迁移至 packages/weixin 工作区包

将 src/services/weixin/ 中的纯业务逻辑迁入 @claude-code-best/weixin
workspace 包，降低 src/ 耦合度。仅保留 server.ts 作为薄适配层。

- 迁移 7 个无修改的纯模块 (types/api/accounts/login/pairing/media/send)
- monitor.ts 内联 PERMISSION_REPLY_RE 正则，解除对 src/ 的依赖
- permissions.ts 本地定义 ChannelPermissionRequestParams 接口
- cli.ts 拆分：serve 子命令通过回调注入，login/access 保留在包内
- server.ts 重写为从 @claude-code-best/weixin 导入
- 新增 cli-serve.ts 作为 serve 入口薄壳

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

bun.lock

@@ -34,6 +34,7 @@
         "@claude-code-best/agent-tools": "workspace:*",
         "@claude-code-best/builtin-tools": "workspace:*",
         "@claude-code-best/mcp-client": "workspace:*",
+        "@claude-code-best/weixin": "workspace:*",
         "@commander-js/extra-typings": "^14.0.0",
         "@growthbook/growthbook": "^1.6.5",
         "@langfuse/otel": "^5.1.0",
@@ -320,6 +321,13 @@
       "name": "url-handler-napi",
       "version": "1.0.0",
     },
+    "packages/weixin": {
+      "name": "@claude-code-best/weixin",
+      "version": "1.0.0",
+      "dependencies": {
+        "qrcode": "^1.5.4",
+      },
+    },
   },
   "packages": {
     "@agentclientprotocol/sdk": ["@agentclientprotocol/sdk@0.19.0", "https://registry.npmmirror.com/@agentclientprotocol/sdk/-/sdk-0.19.0.tgz", { "peerDependencies": { "zod": "^3.25.0 || ^4.0.0" } }, "sha512-U9I8ws9WTOk6jCBAWpXefGSDgVXn14/kV6HFzwWGcstQ02mOQgClMAROHmoIn9GqZbDBDEOkdIbP4P4TEMQdug=="],
@@ -564,6 +572,8 @@
 
     "@claude-code-best/mcp-client": ["@claude-code-best/mcp-client@workspace:packages/mcp-client"],
 
+    "@claude-code-best/weixin": ["@claude-code-best/weixin@workspace:packages/weixin"],
+
     "@commander-js/extra-typings": ["@commander-js/extra-typings@14.0.0", "https://registry.npmmirror.com/@commander-js/extra-typings/-/extra-typings-14.0.0.tgz", { "peerDependencies": { "commander": "~14.0.0" } }, "sha512-hIn0ncNaJRLkZrxBIp5AsW/eXEHNKYQBh0aPdoUqNgD+Io3NIykQqpKFyKcuasZhicGaEZJX/JBSIkZ4e5x8Dg=="],
 
     "@emnapi/core": ["@emnapi/core@1.9.2", "https://registry.npmmirror.com/@emnapi/core/-/core-1.9.2.tgz", { "dependencies": { "@emnapi/wasi-threads": "1.2.1", "tslib": "^2.4.0" } }, "sha512-UC+ZhH3XtczQYfOlu3lNEkdW/p4dsJ1r/bP7H8+rhao3TTTMO1ATq/4DdIi23XuGoFY+Cz0JmCbdVl0hz9jZcA=="],