refactor(app): 移除分类和详情模块，新增云开发测试页

- 从项目中删除分类页及相关代码和样式文件
- 从项目中删除详情页及相关代码和样式文件
- 首页简化为欢迎界面并添加跳转云开发测试页入口
- 更新自定义底部栏移除分类入口
- 更新app.js初始化云开发环境
- 修改app.json移除分类页面配置
- 调整首页样式和交互，提高简洁度
- 配置云函数目录路径cloudfunctionRoot为cloudfunctions/

pages/index/index.wxml

@@ -1,98 +1,20 @@
 <!--pages/index/index.wxml-->
 <view class="container">
-  <!-- 搜索栏 -->
-  <view class="search-bar">
-    <van-search
-      value="{{ searchValue }}"
-      placeholder="搜索信息"
-      shape="round"
-      bind:search="onSearch"
-      bind:change="onSearchChange"
-    />
+  <view class="welcome-section">
+    <text class="welcome-title">信息服务小程序</text>
+    <text class="welcome-subtitle">基于微信云开发</text>
   </view>
 
-  <!-- 轮播图 -->
-  <view class="banner-section" wx:if="{{ bannerList.length > 0 }}">
-    <swiper
-      class="banner-swiper"
-      indicator-dots
-      autoplay
-      circular
-      interval="3000"
-    >
-      <swiper-item wx:for="{{ bannerList }}" wx:key="id">
-        <image class="banner-image" src="{{ item.image }}" mode="aspectFill" />
-      </swiper-item>
-    </swiper>
-  </view>
-
-  <!-- 分类入口 -->
-  <view class="category-section card">
-    <view class="category-grid">
-      <view
-        class="category-item"
-        wx:for="{{ categoryList }}"
-        wx:key="id"
-        data-id="{{ item.id }}"
-        data-name="{{ item.name }}"
-        bindtap="onCategoryTap"
+  <view class="menu-section">
+    <van-cell-group>
+      <van-cell 
+        title="云开发测试" 
+        label="测试云函数、云数据库、云存储"
+        is-link 
+        bindtap="goCloudTest"
       >
-        <view class="category-icon">
-          <van-icon name="apps-o" size="48rpx" color="#1890ff" />
-        </view>
-        <text class="category-name">{{ item.name }}</text>
-      </view>
-    </view>
-  </view>
-
-  <!-- 信息列表 -->
-  <view class="info-section">
-    <view class="section-header">
-      <text class="section-title">最新资讯</text>
-    </view>
-
-    <view class="info-list">
-      <view
-        class="info-item card"
-        wx:for="{{ infoList }}"
-        wx:key="id"
-        data-id="{{ item.id }}"
-        bindtap="onInfoTap"
-      >
-        <view class="info-content">
-          <view class="info-text">
-            <text class="info-title ellipsis-2">{{ item.title }}</text>
-            <text class="info-summary ellipsis-2">{{ item.summary }}</text>
-            <view class="info-meta">
-              <van-tag plain type="primary" size="medium">{{ item.category }}</van-tag>
-              <text class="info-time">{{ item.timeText }}</text>
-              <text class="info-views">{{ item.views }}阅读</text>
-            </view>
-          </view>
-          <van-image
-            wx:if="{{ item.image }}"
-            class="info-image"
-            width="180rpx"
-            height="120rpx"
-            fit="cover"
-            radius="8rpx"
-            src="{{ item.image }}"
-          />
-        </view>
-      </view>
-    </view>
-
-    <!-- 加载状态 -->
-    <view class="loading-section" wx:if="{{ loading }}">
-      <van-loading size="24px">加载中...</van-loading>
-    </view>
-
-    <!-- 没有更多 -->
-    <view class="no-more" wx:if="{{ !hasMore && infoList.length > 0 }}">
-      <text>— 没有更多了 —</text>
-    </view>
-
-    <!-- 空状态 -->
-    <van-empty wx:if="{{ !loading && infoList.length === 0 }}" description="暂无信息" />
+        <van-icon slot="icon" name="code-o" size="40rpx" color="#1890ff" style="margin-right: 20rpx;" />
+      </van-cell>
+    </van-cell-group>
   </view>
 </view>