feat(miniapp): scaffold WeChat mini program MVP

miniapp/pages/space/index.js

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+const { listMindSpacePages } = require('../../utils/api');
+
+Page({
+  data: {
+    pages: [],
+    loading: false,
+    error: ''
+  },
+
+  onShow() {
+    this.loadPages();
+  },
+
+  async loadPages() {
+    this.setData({ loading: true, error: '' });
+    try {
+      const result = await listMindSpacePages({ limit: 30 });
+      const pages = result?.data || result?.pages || [];
+      this.setData({ pages });
+    } catch (error) {
+      this.setData({ error: error?.message || '页面加载失败' });
+    } finally {
+      this.setData({ loading: false });
+    }
+  },
+
+  openPage(event) {
+    const url = event.currentTarget.dataset.url;
+    if (!url) {
+      wx.showToast({ title: '该页面暂无可打开链接', icon: 'none' });
+      return;
+    }
+    wx.navigateTo({
+      url: `/pages/webview/index?url=${encodeURIComponent(url)}`
+    });
+  }
+});

miniapp/pages/space/index.json

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+{
+  "navigationBarTitleText": "MindSpace 页面"
+}

miniapp/pages/space/index.wxml

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+<view class="page">
+  <view class="toolbar">
+    <text class="title">MindSpace</text>
+    <button class="reload" loading="{{loading}}" bindtap="loadPages">刷新</button>
+  </view>
+
+  <view wx:if="{{error}}" class="error">{{error}}</view>
+
+  <view wx:if="{{pages.length === 0 && !loading}}" class="empty panel">
+    <text>暂无页面</text>
+  </view>
+
+  <view wx:for="{{pages}}" wx:key="id" class="page-card panel" bindtap="openPage" data-url="{{item.publicUrl || item.previewUrl}}">
+    <text class="page-title">{{item.title || '未命名页面'}}</text>
+    <text class="page-meta">{{item.status || item.visibility || ''}}</text>
+  </view>
+</view>

miniapp/pages/space/index.wxss

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+.toolbar {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  margin-bottom: 24rpx;
+}
+
+.title {
+  font-size: 42rpx;
+  font-weight: 800;
+}
+
+.reload {
+  width: 132rpx;
+  height: 64rpx;
+  line-height: 64rpx;
+  border-radius: 12rpx;
+  background: #e7f3f1;
+  color: #0f766e;
+  font-size: 26rpx;
+}
+
+.page-card {
+  display: flex;
+  flex-direction: column;
+  gap: 10rpx;
+  padding: 24rpx;
+  margin-bottom: 18rpx;
+}
+
+.page-title {
+  font-size: 30rpx;
+  font-weight: 700;
+}
+
+.page-meta {
+  color: #64748b;
+  font-size: 24rpx;
+}
+
+.empty {
+  padding: 40rpx;
+  text-align: center;
+  color: #64748b;
+}
+
+.error {
+  margin-bottom: 20rpx;
+  color: #b42318;
+}