chore(frontend): 移除未使用的新手引导组件残留代码

删除开发过程中遗留的未使用文件：
- TourDescription.vue: 未被使用的结构化描述组件
- useTourStepDescription.ts: 步骤key映射，引用的组件从未创建
- TourStepDescriptions/: 空的组件目录

当前实现通过 i18n + HTML 字符串直接提供描述内容，无需这些文件。

frontend/src/components/Guide/TourDescription.vue

@@ -1,157 +0,0 @@
-<template>
-  <div class="tour-description">
-    <!-- 主要段落 -->
-    <p v-if="mainText" class="main-text">{{ mainText }}</p>
-
-    <!-- 特性列表 -->
-    <div v-if="features && features.length > 0" class="features-section">
-      <p v-if="featuresTitle" class="section-title">{{ featuresTitle }}</p>
-      <ul class="features-list">
-        <li v-for="(feature, index) in features" :key="index">
-          <span v-if="feature.icon" class="feature-icon">{{ feature.icon }}</span>
-          <span v-if="feature.label" class="feature-label">{{ feature.label }}</span>
-          <span class="feature-text">{{ feature.text }}</span>
-        </li>
-      </ul>
-    </div>
-
-    <!-- 提示框 -->
-    <div v-if="tip" :class="['tip-box', `tip-${tip.type || 'info'}`]">
-      <span v-if="tip.label" class="tip-label">{{ tip.label }}</span>
-      <div v-if="tip.text" class="tip-text">{{ tip.text }}</div>
-      <ul v-if="tip.items && tip.items.length > 0" class="tip-list">
-        <li v-for="(item, index) in tip.items" :key="index">{{ item }}</li>
-      </ul>
-    </div>
-
-    <!-- 行动提示 -->
-    <p v-if="action" class="action-text">{{ action }}</p>
-
-    <!-- 额外说明 -->
-    <p v-if="note" class="note-text">{{ note }}</p>
-  </div>
-</template>
-
-<script setup lang="ts">
-export interface TourFeature {
-  icon?: string
-  label?: string
-  text: string
-}
-
-export interface TourTip {
-  type?: 'info' | 'success' | 'warning' | 'example'
-  label?: string
-  text?: string
-  items?: string[]
-}
-
-export interface TourDescriptionProps {
-  mainText?: string
-  featuresTitle?: string
-  features?: TourFeature[]
-  tip?: TourTip
-  action?: string
-  note?: string
-}
-
-defineProps<TourDescriptionProps>()
-</script>
-
-<style scoped>
-.tour-description {
-  line-height: 1.7;
-  font-size: 14px;
-}
-
-.main-text {
-  margin-bottom: 12px;
-  color: #374151;
-}
-
-.section-title {
-  margin-bottom: 8px;
-  font-weight: 600;
-  color: #1f2937;
-}
-
-.features-section {
-  margin-bottom: 12px;
-}
-
-.features-list {
-  margin-left: 20px;
-  font-size: 13px;
-}
-
-.features-list li {
-  margin-bottom: 6px;
-}
-
-.feature-icon {
-  margin-right: 4px;
-}
-
-.feature-label {
-  font-weight: 600;
-  margin-right: 4px;
-}
-
-.tip-box {
-  padding: 8px 12px;
-  border-radius: 4px;
-  border-left: 3px solid;
-  font-size: 13px;
-  margin-bottom: 12px;
-}
-
-.tip-info {
-  background: #eff6ff;
-  border-left-color: #3b82f6;
-}
-
-.tip-success {
-  background: #f0fdf4;
-  border-left-color: #10b981;
-}
-
-.tip-warning {
-  background: #fef3c7;
-  border-left-color: #f59e0b;
-}
-
-.tip-example {
-  background: #f0fdf4;
-  border-left-color: #10b981;
-}
-
-.tip-label {
-  font-weight: 600;
-  display: block;
-  margin-bottom: 4px;
-}
-
-.tip-text {
-  margin-bottom: 4px;
-}
-
-.tip-list {
-  margin: 8px 0 0 16px;
-}
-
-.tip-list li {
-  margin-bottom: 4px;
-}
-
-.action-text {
-  margin-top: 12px;
-  color: #10b981;
-  font-weight: 600;
-}
-
-.note-text {
-  font-size: 13px;
-  color: #6b7280;
-  margin-top: 8px;
-}
-</style>

frontend/src/components/Guide/TourStepDescriptions/TourStepDescription.vue

@@ -1,20 +0,0 @@
-<template>
-  <section
-    class="tour-step-description"
-    :lang="locale"
-    :data-step-key="stepKey"
-  >
-    <slot />
-  </section>
-</template>
-
-<script setup lang="ts">
-import type { TourStepKey } from '@/composables/useTourStepDescription'
-
-interface TourStepDescriptionProps {
-  stepKey: TourStepKey
-  locale: string
-}
-
-defineProps<TourStepDescriptionProps>()
-</script>

frontend/src/components/Guide/TourStepDescriptions/index.ts

@@ -1 +0,0 @@
-export { default as TourStepDescription } from './TourStepDescription.vue'