docs: add com.msgbyte.iam plugin document

Author: moonrailgun

client/web/src/plugin/builtin.ts

@@ -75,6 +75,8 @@ export const builtinPlugins: PluginManifest[] = _compact([
     'label.zh-CN': 'IAM 插件',
     name: 'com.msgbyte.iam',
     url: '{BACKEND}/plugins/com.msgbyte.iam/index.js',
+    documentUrl:
+      'https://tailchat.msgbyte.com/docs/advanced-usage/plugins/com.msgbyte.iam',
     version: '0.0.0',
     author: 'moonrailgun',
     description:

server/plugins/com.msgbyte.iam/web/plugins/com.msgbyte.iam/manifest.json

@@ -3,6 +3,7 @@
   "label.zh-CN": "IAM 插件",
   "name": "com.msgbyte.iam",
   "url": "{BACKEND}/plugins/com.msgbyte.iam/index.js",
+  "documentUrl": "https://tailchat.msgbyte.com/docs/advanced-usage/plugins/com.msgbyte.iam",
   "version": "0.0.0",
   "author": "moonrailgun",
   "description": "Provide Tailchat with the function of conveniently accessing external account systems",