feat: add customer service chat, optimize case and homepage, fix api proxy

这一提交完成了多项功能升级与优化：
1.  新增全局浮动客服组件，集成腾讯云TRTC聊天能力并添加错误格式化工具
2.  新增图片资源并调整部分静态文件结构
3.  优化案例页面：重构筛选逻辑、新增空状态处理、添加加载更多功能
4.  优化首页布局：修复统计数字动画、调整移动端适配样式、优化轮播逻辑
5.  重构官方内容获取工具：添加缓存机制、优化媒体资源处理
6.  优化API代理配置，移除默认本地代理并新增环境变量配置
7.  新增页面数据恢复刷新逻辑，优化页面交互体验
8.  修复按钮组件冗余代码，调整头部导航移动端样式

components/site/SiteFooter.vue

@@ -1,6 +1,73 @@
 <script setup>
 const route = useRoute()
 const { openConsultation } = useConsultation()
+const { fetchPublicMediaAsset, fetchPublicSiteConfig } = useOfficialContent()
+
+const { data: siteConfigRows } = await useAsyncData('public-site-config-footer', () =>
+  fetchPublicSiteConfig()
+)
+
+function parseConfigValue(value, fallback) {
+  if (value == null || value === '') return fallback
+  if (typeof value !== 'string') return value
+  try {
+    return JSON.parse(value)
+  } catch {
+    return fallback
+  }
+}
+
+const siteConfig = computed(() => siteConfigRows.value || {})
+const brandConfig = computed(() => parseConfigValue(siteConfig.value.BRAND_PROFILE, {}))
+const contactConfig = computed(() => parseConfigValue(siteConfig.value.CONTACT, {}))
+const footerConfig = computed(() => parseConfigValue(siteConfig.value.FOOTER, {}))
+
+const companyName = computed(
+  () => brandConfig.value.companyName || brandConfig.value.name || '成都大马棒传媒有限公司'
+)
+const companyIntro = computed(
+  () =>
+    brandConfig.value.description ||
+    brandConfig.value.slogan ||
+    '聚焦 AI 搜索增长，用可信内容、全域信源与转化承接帮助品牌建立长期数字资产。'
+)
+const contactAddress = computed(
+  () => contactConfig.value.address || '成都市武侯区芯通科技大厦B座9楼'
+)
+const contactPhone = computed(() => contactConfig.value.phone || '待补充')
+const contactEmail = computed(() => contactConfig.value.email || '待补充')
+const copyrightText = computed(
+  () => footerConfig.value.copyright || `© 2026 ${companyName.value}`
+)
+const legalText = computed(() => {
+  const items = [footerConfig.value.icp || '备案信息待补充', footerConfig.value.privacyText || '隐私说明']
+  return items.filter(Boolean).join(' · ')
+})
+const footerQrAssetId = computed(() => footerConfig.value.qrAssetId || '')
+const isDirectAssetUrl = (value) =>
+  /^(https?:)?\/\//.test(value) || value.startsWith('/') || value.startsWith('data:image/')
+const directQrSrc = computed(() => {
+  const value = String(footerQrAssetId.value || '').trim()
+  return value && isDirectAssetUrl(value) ? value : ''
+})
+const { data: footerQrAsset } = await useAsyncData(
+  'public-site-config-footer-qr',
+  () => {
+    const id = String(footerQrAssetId.value || '').trim()
+    if (!id || isDirectAssetUrl(id)) return null
+    return fetchPublicMediaAsset(id).catch(() => null)
+  },
+  { watch: [footerQrAssetId] }
+)
+const footerQrSrc = computed(
+  () =>
+    directQrSrc.value ||
+    footerQrAsset.value?.url ||
+    footerQrAsset.value?.fileUrl ||
+    footerQrAsset.value?.filePath ||
+    ''
+)
+const footerQrAlt = computed(() => footerQrAsset.value?.alt || footerQrAsset.value?.name || '社媒二维码')
 
 const sourceLabel = computed(() => {
   const labels = {
@@ -22,8 +89,8 @@ const sourceLabel = computed(() => {
   <footer class="subsite-footer" :class="{ 'is-interior': route.path !== '/' }">
     <div class="page-width footer-content">
       <div class="footer-company">
-        <img src="/images/lanhu/slices/home-group114-image33@2x.png" alt="成都大马棒传媒有限公司" />
-        <p>聚焦 AI 搜索增长，用可信内容、全域信源与转化承接帮助品牌建立长期数字资产。</p>
+        <img src="/images/lanhu/slices/home-group114-image33@2x.png" :alt="companyName" />
+        <p>{{ companyIntro }}</p>
         <button type="button" @click="openConsultation({ source: sourceLabel })">
           <span>预约免费诊断</span>
           <AppIcon name="arrow-right" />
@@ -49,23 +116,22 @@ const sourceLabel = computed(() => {
         </div>
         <div>
           <strong>联系我们</strong>
-          <span class="contact-line"
-            ><AppIcon name="location" />成都市武侯区芯通科技大厦B座9楼</span
-          >
-          <span class="contact-line"><AppIcon name="phone" />联系电话：待补充</span>
-          <span class="contact-line"><AppIcon name="message" />商务邮箱：待补充</span>
+          <span class="contact-line"><AppIcon name="location" />{{ contactAddress }}</span>
+          <span class="contact-line"><AppIcon name="phone" />联系电话：{{ contactPhone }}</span>
+          <span class="contact-line"><AppIcon name="message" />商务邮箱：{{ contactEmail }}</span>
         </div>
       </nav>
 
-      <div class="footer-qr" aria-label="专属顾问二维码占位">
-        <span class="qr-pattern" aria-hidden="true"></span>
+      <div class="footer-qr" aria-label="社媒二维码">
+        <img v-if="footerQrSrc" class="qr-image" :src="footerQrSrc" :alt="footerQrAlt" loading="lazy" />
+        <span v-else class="qr-pattern" aria-hidden="true"></span>
         <strong>扫码添加专属顾问</strong>
         <small>获取 1 对 1 GEO 增长建议</small>
       </div>
     </div>
     <div class="footer-legal">
       <div class="page-width">
-        <span>© 2026 成都大马棒传媒有限公司</span><span>备案信息待补充 · 隐私说明</span>
+        <span>{{ copyrightText }}</span><span>{{ legalText }}</span>
       </div>
     </div>
   </footer>
@@ -177,6 +243,14 @@ const sourceLabel = computed(() => {
   justify-items: center;
   text-align: center;
 }
+.qr-image {
+  width: 86px;
+  height: 86px;
+  display: block;
+  border: 7px solid #fff;
+  background: #fff;
+  object-fit: contain;
+}
 .qr-pattern {
   width: 86px;
   height: 86px;