chore: establish V1.1 recovery baseline

miniapp/pages/my-activities/my-activities.js

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+/**
+ * 页面占位骨架
+ */
+Page({
+  data: {},
+  onLoad(options) {},
+  onShow() {}
+});

miniapp/pages/my-activities/my-activities.json

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+{"navigationBarTitleText":"my-activities","usingComponents":{}}

miniapp/pages/my-activities/my-activities.wxml

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+<view class="page"><text>页面: my-activities</text></view>

miniapp/pages/my-activities/my-activities.wxss

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+.page{padding:32rpx;background:#FFF8F7;min-height:100vh;text-align:center;color:#999;padding-top:200rpx;}