feat(scene-editor): 优化多楼层场景保存逻辑，为每个楼层注入楼层号，增强数据完整性

src/pages/scene-editor.vue

@@ -139,7 +139,20 @@ const saveScene = async (payload?: SaveScenePayload) => {
 
   let dataToSave: string | undefined;
   if (floorScenes.value.length > 1) {
-    dataToSave = JSON.stringify(floorScenes.value);
+    // 多楼层：为每个楼层的 JSON 注入 floor 楼层号（从 1 开始）
+    const floorsWithIndex = floorScenes.value.map((scene: any, idx: number) => {
+      try {
+        const obj = typeof scene === 'string' ? JSON.parse(scene) : scene;
+        if (obj && typeof obj === 'object') {
+          return { ...obj, floor: idx + 1 };
+        }
+        return obj;
+      } catch {
+        // 解析失败则原样返回，避免中断保存
+        return scene;
+      }
+    });
+    dataToSave = JSON.stringify(floorsWithIndex);
   } else {
     const singleScene = floorScenes.value[0];
     if (typeof singleScene === 'string') {