添加消息类型枚举和相关字段，优化消息记录服务的添加方法，更新多个组件以支持新增分类对话框

Web/src/components/PopupContainer.vue

@@ -30,6 +30,11 @@
       <div class="popup-scroll-content">
         <slot></slot>
       </div>
+
+      <!-- 底部页脚，固定不可滚动 -->
+      <div v-if="slots.footer" class="popup-footer-fixed">
+        <slot name="footer"></slot>
+      </div>
     </div>
   </van-popup>
 </template>
@@ -150,4 +155,11 @@ const hasActions = computed(() => !!slots['header-actions'])
   overflow-x: hidden;
   -webkit-overflow-scrolling: touch;
 }
+
+.popup-footer-fixed {
+  flex-shrink: 0;
+  border-top: 1px solid var(--van-border-color, #ebedf0);
+  background-color: var(--van-background-2, #f7f8fa);
+  padding: 12px 16px;
+}
 </style>