fix(mp): P1+P2 稳定性加固 — 导航安全+生产日志+分包预加载+logout清理

P1:
- 全局 23 个页面 Taro.navigateTo → safeNavigateTo，防止页栈超10层
- 生产构建保留 console.warn/error，便于线上问题排查
- 添加 preloadRule 分包预加载（首页预加载健康/医生/文章分包）

P2:
- logout 时清理 ai_chat_history + BLE DataBuffer 缓存
- restore() 移除冗余的双重 Storage 读取（secureGet 已包含 getStorageSync）
- 首页文章图片添加 lazyLoad

apps/miniprogram/src/app.config.ts

@@ -76,6 +76,20 @@ export default defineAppConfig({
       { pagePath: 'pages/profile/index', text: '我的', iconPath: 'assets/tabbar/profile.png', selectedIconPath: 'assets/tabbar/profile-active.png' },
     ],
   },
+  preloadRule: {
+    'pages/index/index': {
+      network: 'all',
+      packages: ['pages/pkg-health', 'pages/pkg-doctor-core', 'pages/article'],
+    },
+    'pages/health/index': {
+      network: 'all',
+      packages: ['pages/pkg-health'],
+    },
+    'pages/consultation/index': {
+      network: 'all',
+      packages: ['pages/pkg-consultation'],
+    },
+  },
   window: {
     backgroundTextStyle: 'dark',
     navigationBarBackgroundColor: '#FFFFFF',