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/AddClassifyDialog.vue

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+<template>
+  <van-dialog 
+    v-model:show="show" 
+    title="新增交易分类" 
+    show-cancel-button
+    @confirm="handleConfirm"
+  >
+    <van-field v-model="classifyName" placeholder="请输入新的交易分类" />
+  </van-dialog>
+</template>
+
+<script setup>
+import { ref } from 'vue'
+import { showToast } from 'vant'
+
+const emit = defineEmits(['confirm'])
+
+const show = ref(false)
+const classifyName = ref('')
+
+// 打开弹窗
+const open = () => {
+  classifyName.value = ''
+  show.value = true
+}
+
+// 确认
+const handleConfirm = () => {
+  if (!classifyName.value.trim()) {
+    showToast('请输入分类名称')
+    return
+  }
+  
+  emit('confirm', classifyName.value.trim())
+  show.value = false
+  classifyName.value = ''
+}
+
+// 暴露方法给父组件
+defineExpose({
+  open
+})
+</script>