feat: APP 配置新增企业微信 Schema，写入 Info.plist wxworkSchema 键

与微信登录 AppID 处理一致：填写则写入 Info.plist 的 wxworkSchema，
未配置则移除该键。前端「关联配置」区新增输入框，打包流程透传该字段。

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_011wQh7H1Dn3TjQm87TyYgvf

config.example.json

@@ -11,6 +11,7 @@
       "tencent": "",
       "weixinlogin": "",
       "weixinpay": "",
+      "wxworkSchema": "",
       "skins": ["default.zip"],
       "certificates": {
         "Ad_Hoc": {