miao33: 从 main 同步 single_uniapp22miao，dart-sass 兼容修复，DEPLOY.md 更新

- 从 main 获取 single_uniapp22miao 子项目
- dart-sass: /deep/ -> ::v-deep，calc 运算符加空格
- DEPLOY.md 采用 shccd159 版本（4 子项目架构说明）

Made-with: Cursor

single_uniapp22miao/pages/sub-pages/setting/404.vue

@@ -0,0 +1,70 @@
+<template>
+  <view class="error-page">
+    <view class="error-content">
+      <text class="error-icon">404</text>
+      <text class="error-title">页面不存在</text>
+      <text class="error-desc">抱歉，您访问的页面找不到了</text>
+      <button class="back-btn" @click="goBack">返回首页</button>
+    </view>
+  </view>
+</template>
+
+<script>
+export default {
+  methods: {
+    goBack() {
+      uni.switchTab({
+        url: '/pages/index/index'
+      });
+    }
+  }
+}
+</script>
+
+<style lang="scss" scoped>
+.error-page {
+  min-height: 100vh;
+  background-color: #f5f5f5;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+}
+
+.error-content {
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  
+  .error-icon {
+    font-size: 120rpx;
+    font-weight: bold;
+    color: #ccc;
+    margin-bottom: 40rpx;
+  }
+  
+  .error-title {
+    font-size: 36rpx;
+    font-weight: bold;
+    color: #333;
+    margin-bottom: 20rpx;
+  }
+  
+  .error-desc {
+    font-size: 26rpx;
+    color: #999;
+    margin-bottom: 60rpx;
+  }
+  
+  .back-btn {
+    width: 300rpx;
+    height: 80rpx;
+    line-height: 80rpx;
+    background: linear-gradient(90deg, #FF6B6B, #FF4757);
+    color: #fff;
+    border-radius: 40rpx;
+    font-size: 28rpx;
+    border: none;
+  }
+}
+</style>
+