feat: add version and updatedAt fields with export check and display

index.html

@@ -253,7 +253,10 @@ body {
 
 <div class="container">
   <div class="header">
-    <h1 id="configName">PC装机配置表</h1>
+    <div>
+      <h1 id="configName">PC装机配置表</h1>
+      <div id="configMeta" style="font-size:12px;color:#999;margin-top:4px"></div>
+    </div>
   </div>
 
   <div id="contentArea"></div>
@@ -286,13 +289,25 @@ function loadFromURL() {
   if (configURL) {
     fetch(configURL)
       .then(r => { if (!r.ok) throw new Error(`HTTP ${r.status}`); return r.json(); })
-      .then(data => { config = data; document.getElementById('configName').textContent = config.configName || 'PC装机配置表'; render(); })
+      .then(data => { config = data; document.getElementById('configName').textContent = config.configName || 'PC装机配置表'; updateMeta(); render(); })
       .catch(err => { console.error('加载配置失败:', err); render(); });
   } else {
     render();
   }
 }
 
+// ========== Meta ==========
+function updateMeta() {
+  const meta = document.getElementById('configMeta');
+  const parts = [];
+  if (config.version) parts.push('v' + config.version);
+  if (config.updatedAt) {
+    const d = new Date(config.updatedAt);
+    parts.push('更新于 ' + d.toLocaleDateString('zh-CN') + ' ' + d.toLocaleTimeString('zh-CN', {hour:'2-digit', minute:'2-digit'}));
+  }
+  meta.textContent = parts.join(' · ');
+}
+
 // ========== Render ==========
 function render() {
   const area = document.getElementById('contentArea');