fix: polish earth legend and info panel interactions

frontend/public/earth/index.html

@@ -33,7 +33,10 @@
   <div id="container">
     <div id="info-panel">
       <h1>智能星球计划</h1>
-      <div class="subtitle">现实层宇宙全息感知系统 | 卫星 · 海底光缆 · 算力基础设施</div>
+      <div class="subtitle">
+        <span class="subtitle-main">现实层宇宙全息感知系统</span>
+        <span class="subtitle-meta">卫星 · 海底光缆 · 算力基础设施</span>
+      </div>
       
       <div id="info-card" class="info-card" style="display: none;">
         <div class="info-card-header">
@@ -90,6 +93,12 @@
                 </span>
                 <span class="tooltip">显示卫星</span>
               </button>
+              <button id="toggle-bgp" class="toolbar-btn floating-btn liquid-glass-surface active" title="显示/隐藏BGP观测">
+                <span class="icon" aria-hidden="true">
+                  <span class="material-symbols-rounded">radar</span>
+                </span>
+                <span class="tooltip">隐藏BGP观测</span>
+              </button>
               <button id="toggle-cables" class="toolbar-btn floating-btn liquid-glass-surface active" title="显示/隐藏线缆">
                 <span class="icon" aria-hidden="true">
                   <span class="material-symbols-rounded">cable</span>
@@ -194,6 +203,10 @@
         <span class="stats-label">卫星:</span>
         <span class="stats-value" id="satellite-count">0 颗</span>
       </div>
+      <div class="stats-item">
+        <span class="stats-label">BGP异常:</span>
+        <span class="stats-value" id="bgp-anomaly-count">0 条</span>
+      </div>
       <div class="stats-item">
         <span class="stats-label">视角距离:</span>
         <span class="stats-value" id="camera-distance">300 km</span>
@@ -207,7 +220,7 @@
     <div id="loading">
       <div id="loading-spinner"></div>
       <div id="loading-title">正在初始化全球态势数据...</div>
-      <div id="loading-subtitle" style="font-size:0.9rem; margin-top:10px; color:#aaa;">同步卫星、海底光缆与登陆点数据</div>
+      <div id="loading-subtitle" style="font-size:0.9rem; margin-top:10px; color:#aaa;">同步卫星、海底光缆、登陆点与BGP异常数据</div>
     </div>
     <div id="status-message" class="status-message" style="display: none;"></div>
     <div id="tooltip" class="tooltip"></div>