feat(sae): add Java MVP backend and Taobao connectivity page

Spring Boot 3.5.6 / Java 17 JAR with cloud gateway envelope and ping/whoami/echo; Taobao gateway signature verification matching the Node implementation; /pages/mvp page, splash dev entry and local transport contract test; SAE + 聚石塔 runbook and portable JDK/Maven setup; Windows 11 wmic shim for Taobao DevTools.

taobao/pages/splash/splash.js

@@ -1,6 +1,7 @@
 /* ═════ 启动页:品牌底图 + Slogan + 隐私授权弹窗(对齐 H5 #s-splash + #p-privacy) ═════ */
 var api = require('../../utils/api.js');
 var development = require('../../utils/development');
+var config = require('../../config');
 
 Page({
   data: {
@@ -8,7 +9,8 @@ Page({
     logoUrl: api.assetUrl('img/ui-20261012/brand-lockup.png'),
     showPrivacy: false,  // 隐私授权弹窗
     agreed: false,       // 隐私协议勾选
-    showPolicy: false, busy: false, signedIn: false, showCameraDebug: development.cameraDebugEnabled()
+    showPolicy: false, busy: false, signedIn: false, showCameraDebug: development.cameraDebugEnabled(),
+    showMvpDebug: config.mvpLocal === true
   },
   onShow: function () {
     var that = this;
@@ -65,6 +67,10 @@ Page({
     if (!development.cameraDebugEnabled()) return;
     my.navigateTo({ url: '/pages/camera/camera?debug=camera' });
   },
+  onMvpDebug: function () {
+    if (!config.mvpLocal) return;
+    my.navigateTo({ url: '/pages/mvp/mvp' });
+  },
 
   noop: function () {} // 弹窗卡片内点击拦截冒泡用
 });