feat: 右侧浮窗组件重写 — 4 种模块 + JS 动态渲染

新增文件:
- css/float-widget.css: 浮窗按钮/弹出面板/QQ列表/二维码样式
- js/float-widget.js: 4 种模块渲染 + 回到顶部 + 后台数据接口

修改文件:
- header.html: 引入新 CSS/JS
- public/header.html: 替换旧 aside-tools 为 float-widget 容器

模块类型:
1. QQ客服: hover 弹出 QQ 号列表+在线时间
2. 在线客服: 点击新标签页跳转
3. 群聊: hover 弹出二维码
4. 公众号: hover 弹出二维码

数据来源: window.__FLOAT_WIDGET_DATA__ (后台注入) 或 JS 内 demo 数据

public/header.html

@@ -219,85 +219,10 @@
   </div>
 </div>
 
-<!-- 侧边 -->
-<!-- 回到顶部按钮 - 独立在侧边工具栏上方 -->
-<div class="back-top-wrapper" id="backTop">
-  <img src="/web/BlackFruit-web/assets/img/header/up.png" alt="回到顶部">
-</div>
-
-<div class="aside-tools">
-  <div class="tools-list">
-    {if ( isset($data.side_floating_window) ) }
-    {foreach $data.side_floating_window as $key=>$value}
-    <div class="tools-item">
-      <img src="{$value.icon}" alt="">
-      <div class="tools-box">
-        <div class="tools-box-s">
-          <h5>{$value.name}</h5>
-          {$value.content|raw}
-        </div>
-      </div>
-    </div>
-    {/foreach}
-    {else /}
-    <div class="tools-item">
-      <img src="/web/BlackFruit-web/assets/img/index/phone.png" alt="">
-      <div class="tools-box">
-        <div class="tools-box-s">
-          <h5>电话咨询</h5>
-          <p>7*24h不间断服务</p>
-          <p class="com-contact-tel">{$data.enterprise_telephone|default=''}</p>
-        </div>
-      </div>
-    </div>
-    <div class="tools-item">
-      <img src="/web/BlackFruit-web/assets/img/index/listen.png" alt="">
-      <div class="tools-box">
-        <div class="tools-box-s">
-          <h5>在线客服</h5>
-          <p>工作日 09:00-18:00</p>
-          <a href="{$data.online_customer_service_link|default='javascript:;'}" class="line-server-btn" target="_blank">
-            <div class="button">立即查询</div>
-          </a>
-        </div>
-      </div>
-    </div>
-    <div class="tools-item">
-      <img src="/web/BlackFruit-web/assets/img/index/worl-order.png" alt="">
-      <div class="tools-box">
-        <div class="tools-box-s">
-          <h5>提交工单</h5>
-          <p>专业工程师快速响应</p>
-          <a href="/plugin/27/ticket.htm">
-            <div class="button">立即提交</div>
-          </a>
-        </div>
-      </div>
-    </div>
-    <div class="tools-item">
-      <img src="/web/BlackFruit-web/assets/img/index/message.png" alt="">
-      <div class="tools-box">
-        <div class="tools-box-s">
-          <h5>意见反馈</h5>
-          <p>您的意见是我们不断前进的动力</p>
-          <a href="/feedback.html">
-            <div class="button">立即反馈</div>
-          </a>
-        </div>
-      </div>
-    </div>
-    <div class="tools-item">
-      <img src="/web/BlackFruit-web/assets/img/index/cart.png" alt="">
-      <div class="tools-box">
-        <div class="tools-box-s">
-          <h5>购物车</h5>
-          <p>从这里开始，打造云端专属空间</p>
-          <a href="/cart/shoppingCar.htm">
-            <div class="button">前往购物车</div>
-          </a>
-        </div>
-      </div>
-    </div>
-    {/if}
-  </div>
-</div>
+<!-- 右侧浮窗 — 由 float-widget.js 动态渲染 -->
+{if ( isset($data.side_floating_window) && !empty($data.side_floating_window) ) }
+<script>
+  window.__FLOAT_WIDGET_DATA__ = {:json_encode($data['side_floating_window'])};
+</script>
+{/if}
+<div class="float-widget"></div>