feat(home): 完成首页全面重构与新增多个板块组件

- 重构首页结构，增加Banner轮播与左侧快捷入口
- 新增单位企业广告区及会员服务广告区
- 实现决策咨询板块，涵盖市县决策、行业资讯、前沿观察、企业动态
- 设计决策参考板块，展示政策原文、深度解读、研究成果、专题研究
- 完善专家资讯板块，包含专家视点、专家动态及专家申请卡片
- 添加智库观察板块与翰墨文谈板块，丰富内容分类
- 底部功能区新增资料下载、申报模板、成果报送、联系我们快捷链接
- 采用蓝色主色调和卡片式布局，提升视觉统一与响应式体验
- 使用模拟数据占位，便于后续接入实际API数据
- 重构SiteFooter提升一致性与风格统一

app/components/home/ArticleItem.vue

@@ -0,0 +1,102 @@
+<template>
+  <div class="article-item" :class="{ 'has-image': showImage && article.image }">
+    <NuxtLink :to="article.link || `/article/${article.id}`" class="article-link">
+      <div class="article-content">
+        <div class="article-title">{{ article.title }}</div>
+        <div class="article-meta">
+          <span v-if="article.source" class="source">{{ article.source }}</span>
+          <span class="date">{{ article.date }}</span>
+        </div>
+      </div>
+      <img v-if="showImage && article.image" :src="article.image" :alt="article.title" class="article-image" />
+    </NuxtLink>
+  </div>
+</template>
+
+<script setup lang="ts">
+interface Article {
+  id: number
+  title: string
+  date: string
+  source?: string
+  image?: string
+  link?: string
+}
+
+defineProps<{
+  article: Article
+  showImage?: boolean
+}>()
+</script>
+
+<style scoped>
+.article-item {
+  padding: 10px 0;
+  border-bottom: 1px dashed #eee;
+}
+
+.article-item:last-child {
+  border-bottom: none;
+}
+
+.article-link {
+  display: flex;
+  align-items: flex-start;
+  gap: 12px;
+  text-decoration: none;
+  color: inherit;
+}
+
+.article-content {
+  flex: 1;
+  min-width: 0;
+}
+
+.article-title {
+  font-size: 14px;
+  color: #333;
+  line-height: 1.5;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  display: -webkit-box;
+  -webkit-line-clamp: 2;
+  -webkit-box-orient: vertical;
+  transition: color 0.2s;
+}
+
+.article-link:hover .article-title {
+  color: #1e3a5f;
+}
+
+.article-meta {
+  display: flex;
+  align-items: center;
+  gap: 12px;
+  margin-top: 6px;
+  font-size: 12px;
+  color: #999;
+}
+
+.source {
+  color: #e74c3c;
+}
+
+.article-image {
+  width: 100px;
+  height: 70px;
+  object-fit: cover;
+  border-radius: 4px;
+  flex-shrink: 0;
+}
+
+.has-image .article-title {
+  -webkit-line-clamp: 1;
+}
+
+@media (max-width: 576px) {
+  .article-image {
+    width: 80px;
+    height: 56px;
+  }
+}
+</style>