feat: type the plugin host record, move plugin strings out of core and add lint checks

plugins/ai/locales/translated/zh_CN.json

@@ -83,5 +83,8 @@
         "description": "允许 AI 助手在此主机的终端上提供帮助。默认情况下处于关闭状态，但仍需在您的帐户中启用 AI 功能。"
       }
     }
+  },
+  "hosts": {
+    "docsLink": "查看文档"
   }
 }