refactor(消息系统): 统一将通知类型从notification改为system

- 修改API文档注释，增加消息状态和类型参数说明
- 更新组件中notification相关类名和逻辑为system
- 调整消息列表页的tab和过滤逻辑
- 添加默认头像常量

@@ -11,6 +11,9 @@ const Api = {
 /**
  * @description: 所有消息列表
  * @param {*} params
+ * @param {number} params.status - 消息状态, 3=未读，5=已读
+ * @param {number} params.type - 消息类型, system=系统消息，chat=聊天消息
+ * @param {number} params.keyword - 搜索关键词
  * @param {number} params.page - 页码，从0开始
  * @param {number} params.limit - 每页数量
  * @returns data.list[{
@@ -20,6 +23,8 @@ const Api = {
  *   note: 消息内容
  *   create_time: 创建时间
  *   created_time_desc: 消息创建时间描述
+ *   partner_nickname: 聊天人昵称
+ *   partner_avatar_url: 聊天人头像
  * }]
  */
 export const getMessagesListAPI = (params) => fn(fetch.get(Api.GET_MESSAGES_LIST, params));

@@ -30,7 +30,7 @@
       <!-- 消息内容区域 -->
       <view class="detail-content">
         <!-- 系统通知样式 -->
-        <view v-if="conversation?.type === 'notification'" class="notification-content">
+        <view v-if="conversation?.type === 'system'" class="system-content">
           <view class="message-content">
             <text class="text-base">{{ conversation?.lastMessage }}</text>
           </view>
@@ -97,7 +97,7 @@
           @click="handleClose"
           color="orange"
         >
-          {{ conversation?.type === 'notification' ? '关闭' : '返回' }}
+          {{ conversation?.type === 'system' ? '关闭' : '返回' }}
         </nut-button>
       </view>
     </view>
@@ -339,7 +339,7 @@ watch(visible, (newVisible) => {
 }
 
 // 系统通知样式
-.notification-content {
+.system-content {
   padding: 24rpx;
   height: 100%;
   overflow-y: auto;

@@ -29,8 +29,8 @@
                 <view class="tab-item" :class="{ active: activeTab === 'unread' }" @click="setActiveTab('unread')">
                     未读
                 </view>
-                <view class="tab-item" :class="{ active: activeTab === 'notification' }"
-                    @click="setActiveTab('notification')">
+                <view class="tab-item" :class="{ active: activeTab === 'system' }"
+                    @click="setActiveTab('system')">
                     通知
                 </view>
             </view>
@@ -46,7 +46,7 @@
                 <nut-row>
                     <nut-col :span="6" class="avatar-container">
                         <view class="relative">
-                            <image v-if="conversation.avatar" :src="conversation.avatar"
+                            <image v-if="conversation.type === 'chat'" :src="conversation.avatar || defaultAvatar"
                                 class="w-12 h-12 rounded-full object-cover" mode="aspectFill" />
                             <view v-else class="w-12 h-12 rounded-full bg-gray-100 flex items-center justify-center">
                                 <component :is="conversation.icon" />
@@ -104,7 +104,7 @@ import { $ } from '@tarojs/extend'
 import Taro from '@tarojs/taro'
 
 // 默认头像
-// const defaultAvatar = 'https://cdn.ipadbiz.cn/mlaj/images/icon_1.jpeg'
+const defaultAvatar = 'https://cdn.ipadbiz.cn/mlaj/images/icon_1.jpeg'
 
 const scrollStyle = ref({
     height: 'calc(100vh - 500rpx)'
@@ -146,15 +146,15 @@ const initData = () => {
 
     // 生成更多初始数据确保可以滚动
     for (let i = 1; i <= 15; i++) {
-        const types = ['chat', 'notification']
+        const types = ['chat', 'system']
         const type = types[i % 2]
 
         mockData.push({
             id: i,
-            name: type === 'notification' ? '系统通知' : `用户${i}`,
+            name: type === 'system' ? '系统通知' : `用户${i}`,
             avatar: type === 'chat' ? `https://randomuser.me/api/portraits/men/${(i % 50) + 1}.jpg` : '',
-            icon: type === 'notification' ? markRaw(Notice) : null,
-            lastMessage: type === 'notification' ? '您有新的系统通知' : `这是第${i}条消息内容`,
+            icon: type === 'system' ? markRaw(Notice) : null,
+            lastMessage: type === 'system' ? '您有新的系统通知' : `这是第${i}条消息内容`,
             time: i <= 5 ? `${i * 5}分钟前` : i <= 10 ? `${i}小时前` : `${i - 10}天前`,
             unread: Math.random() > 0.5,
             type: type
@@ -171,8 +171,8 @@ const filteredConversations = computed(() => {
     // 根据Tab过滤
     if (activeTab.value === 'unread') {
         filtered = filtered.filter(conv => conv.unread)
-    } else if (activeTab.value === 'notification') {
-        filtered = filtered.filter(conv => conv.type === 'notification')
+    } else if (activeTab.value === 'system') {
+        filtered = filtered.filter(conv => conv.type === 'system')
     }
 
     // 根据搜索关键词过滤