feat(douyin-mashida): 彻底重构优化配置面板，支持一键填域名/订阅推送/网关自检并剔除冗余字段

- 剔除历史旧卡券时代废弃的 afterVerifyLink（去使用链接）与 afterVerifyMessage（通知正文）
- 面板新增一键填入当前域名、向开放平台一键订阅推送、停用推送以及网关连通与签名自检功能
- 业务配置重构为「基础接入与商户凭据」、「买家 H5 直充与发货私信」、「高级网关设置」三层清晰结构
- 后端与前端服务新增 /douyin-mashida/subscribe 与 /douyin-mashida/test-gateway 统一接口

验证方式：前端类型检查与打包构建通过，全量 132 项前端单测与 674 项后端单测全部通过

apps/backend/src/routes/admin/platform-config/douyin-mashida.ts

@@ -3,6 +3,8 @@ import { Router } from 'express'
 import {
   getAdminDouyinMashidaConfig,
   saveAdminDouyinMashidaConfig,
+  subscribeAdminDouyinMashidaPush,
+  testAdminDouyinMashidaGateway,
 } from '../../../services/admin/platform-config/douyin-mashida-service.js'
 import { createJsonHandler } from '../session.js'
 import type { JsonRecord } from '../../../types/json.js'
@@ -49,4 +51,35 @@ router.post(
   }),
 )
 
+router.post(
+  '/douyin-mashida/subscribe',
+  createJsonHandler((req) => subscribeAdminDouyinMashidaPush(req.body as JsonRecord), {
+    successMessage: '平台推送设置成功',
+    errorMessage: '平台推送设置失败',
+    scope: '[admin/platform-config/douyin-mashida/subscribe]',
+    audit: (req, _data) => {
+      const payload = req.body as JsonRecord
+      return {
+        action: 'platform_douyin_mashida_subscribe_updated',
+        targetType: 'platform_config',
+        targetId: 'douyin_mashida',
+        data: {
+          disable: Boolean(payload?.disable),
+          messageUrl: String(payload?.messageUrl || payload?.publicUrl || ''),
+        },
+      }
+    },
+  }),
+)
+
+router.post(
+  '/douyin-mashida/test-gateway',
+  createJsonHandler(() => testAdminDouyinMashidaGateway(), {
+    successMessage: '网关测试完成',
+    errorMessage: '网关测试失败',
+    scope: '[admin/platform-config/douyin-mashida/test-gateway]',
+  }),
+)
+
 export default router
+