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

editor.html

@@ -431,6 +431,7 @@ body {
   <div class="header">
     <h1 id="configName">PC装机配置表 - 编辑器</h1>
     <div class="header-actions">
+      <span class="version-info" style="font-size:13px;color:#999;margin-right:8px">版本: <input type="text" id="versionInput" value="1.0.0" style="width:80px;padding:2px 6px;border:1px solid #d9d9d9;border-radius:4px;font-size:13px" onchange="config.version=this.value"></span>
       <button class="btn btn-default btn-sm" onclick="openLocalFile()">打开文件</button>
       <button class="btn btn-primary btn-sm" onclick="exportJSON()">导出JSON</button>
     </div>
@@ -551,7 +552,8 @@ body {
 
 <script>
 // ========== State ==========
-let config = { configName: 'PC装机配置表', components: [] };
+let config = { configName: 'PC装机配置表', version: '1.0.0', updatedAt: '', components: [] };
+let initialVersion = '1.0.0';
 let tempAlts = [];
 
 const PRESET_TYPES = ['CPU', '主板', '显卡', '内存', '硬盘', '电源', '机箱', '散热器', '显示器'];
@@ -666,6 +668,8 @@ function handleFileImport(event) {
   reader.onload = (e) => {
     try {
       config = JSON.parse(e.target.result);
+      initialVersion = config.version || '1.0.0';
+      document.getElementById('versionInput').value = initialVersion;
       document.getElementById('configName').textContent = (config.configName || 'PC装机配置表') + ' - 编辑器';
       render();
     } catch (err) {
@@ -677,6 +681,11 @@ function handleFileImport(event) {
 }
 
 function exportJSON() {
+  config.version = document.getElementById('versionInput').value.trim() || '1.0.0';
+  if (config.version === initialVersion) {
+    if (!confirm(`版本号仍为 ${config.version}，未修改。是否继续导出？`)) return;
+  }
+  config.updatedAt = new Date().toISOString();
   const json = JSON.stringify(config, null, 2);
   const blob = new Blob([json], { type: 'application/json' });
   const url = URL.createObjectURL(blob);