feat: 注册内建 weixin channel 插件

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

src/services/mcp/__tests__/channelAllowlist.test.ts

@@ -0,0 +1,17 @@
+import { describe, expect, mock, test } from 'bun:test'
+
+mock.module('../../analytics/growthbook.js', () => ({
+  getFeatureValue_CACHED_MAY_BE_STALE: () => [],
+}))
+
+import { isChannelAllowlisted } from '../channelAllowlist.js'
+
+describe('isChannelAllowlisted', () => {
+  test('allows builtin weixin plugin', () => {
+    expect(isChannelAllowlisted('weixin@builtin')).toBe(true)
+  })
+
+  test('rejects undefined plugin source', () => {
+    expect(isChannelAllowlisted(undefined)).toBe(false)
+  })
+})

src/services/mcp/channelAllowlist.ts

@@ -16,6 +16,7 @@
  */
 
 import { z } from 'zod/v4'
+import { BUILTIN_MARKETPLACE_NAME } from '../../plugins/builtinPlugins.js'
 import { lazySchema } from '../../utils/lazySchema.js'
 import { parsePluginIdentifier } from '../../utils/plugins/pluginIdentifier.js'
 import { getFeatureValue_CACHED_MAY_BE_STALE } from '../analytics/growthbook.js'
@@ -68,6 +69,9 @@ export function isChannelAllowlisted(
   if (!pluginSource) return false
   const { name, marketplace } = parsePluginIdentifier(pluginSource)
   if (!marketplace) return false
+   if (marketplace === BUILTIN_MARKETPLACE_NAME && name === 'weixin') {
+    return true
+  }
   return getChannelAllowlist().some(
     e => e.plugin === name && e.marketplace === marketplace,
   )