feat(maps): 战略地图版本管理完整实现（方案B）— versions API列表/详情/回滚带自动备份/备注 + MapVersions独立版本页 + 路由注册 + 版本弹窗接真实数据 (project-20260908-map-versions-page)

frontend/src/components/map-canvas/MapCanvasDialogs.vue

@@ -153,15 +153,20 @@
   <!-- ==========================================================
     版本历史弹窗（不变）
   ========================================================== -->
-  <MyDialog :model-value="showVersions" @update:model-value="$emit('update:showVersions', $event)" title="版本历史" :width="620">
+  <MyDialog :model-value="showVersions" @update:model-value="$emit('update:showVersions', $event)" title="版本历史" :width="640">
     <div style="max-height:400px;overflow-y:auto;">
       <table class="mc-table" v-if="versions.length > 0">
-        <thead><tr><th>说明</th><th>创建时间</th><th>操作</th></tr></thead>
+        <thead><tr><th>版本</th><th>说明</th><th>摘要</th><th>创建时间</th><th>操作</th></tr></thead>
         <tbody>
           <tr v-for="v in versions" :key="v.id">
+            <td>
+              <span style="font-weight:600;color:#409eff;">{{ v.version }}</span>
+              <el-tag v-if="v.is_current" size="small" type="success" style="margin-left:4px;">当前</el-tag>
+            </td>
             <td>{{ v.comment || '-' }}</td>
+            <td style="color:#909399;font-size:12px;">{{ v.dimension_count ?? 0 }}维 · {{ v.objective_count ?? 0 }}目标 · {{ v.kpi_count ?? 0 }}KPI</td>
             <td>{{ v.created_at }}</td>
-            <td><el-button size="small" type="warning" @click="$emit('rollback-version', v.id)">回滚</el-button></td>
+            <td><el-button size="small" type="warning" :disabled="v.is_current" @click="$emit('rollback-version', v.id)">回滚</el-button></td>
           </tr>
         </tbody>
       </table>