chore(components): 移除未使用的 PageTitle 组件

- 删除了整个 PageTitle.unuse 文件
- 清理了未被引用的页面标题组件代码
- 移除了相关的模板、脚本和样式定义
- 简化了组件库结构

src/components/PageTitle.unuse

@@ -1,59 +0,0 @@
-<template>
-  <view>
-    <view v-if="useCustomNav" class="custom-nav">
-      <view class="nav-title">{{ title }}</view>
-    </view>
-    <view class="text-area">
-      <text class="title">{{ title }}</text>
-    </view>
-  </view>
-</template>
-
-<script setup lang="ts">
-import { defineProps } from 'vue'
-
-const props = defineProps({
-  title: { type: String, required: true },
-  useCustomNav: { type: Boolean, default: false }
-})
-
-const title = props.title
-const useCustomNav = props.useCustomNav
-</script>
-
-<style scoped>
-.text-area {
-  display: flex;
-  justify-content: center;
-  align-items: center;
-  margin-top: 40rpx;
-}
-
-.title {
-  font-size: 36rpx;
-  color: #8f8f94;
-  font-weight: 400;
-}
-
-.custom-nav {
-  position: fixed;
-  left: 0;
-  right: 0;
-  top: 0;
-  height: 88rpx;
-  padding-top: constant(safe-area-inset-top);
-  padding-top: env(safe-area-inset-top);
-  background-color: #fff;
-  display: flex;
-  align-items: center;
-  justify-content: center;
-  z-index: 1000;
-  border-bottom: 1rpx solid #eee;
-}
-
-.nav-title {
-  font-size: 34rpx;
-  font-weight: bold;
-  color: #333;
-}
-</style>