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.acss

@@ -142,3 +142,4 @@
 .brand-row { justify-content: center; }
 .brand-logo { width: 450rpx; height: 52rpx; margin: 0; }
 .camera-debug-entry { position: absolute; z-index: 2; top: 24rpx; right: 24rpx; padding: 16rpx 24rpx; border-radius: 16rpx; color: #fff; background: rgba(0,0,0,.65); font-size: 24rpx; }
+.mvp-debug-entry { top: 100rpx; }

taobao/pages/splash/splash.axml

@@ -1,6 +1,7 @@
 <!-- ═════ 01 启动页 ═════ -->
 <view class="splash">
   <view class="camera-debug-entry" a:if="{{showCameraDebug}}" onTap="onCameraDebug">开发调试 · 相机验收</view>
+  <view class="camera-debug-entry mvp-debug-entry" a:if="{{showMvpDebug}}" onTap="onMvpDebug">SAE MVP 连通性</view>
   <image class="splash-bg" src="{{bgUrl}}" mode="aspectFill" />
   <view class="splash-slogan">
     <text>1'me,</text>

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
 });