feat(distribution): 站内信与通知体系多租户独立分支隔离

- 新增 000071 数据库迁移：notifications 表支持 distribution_site_id 并自动回填历史分销订单通知
- 通知自动归属：在事务内根据订单或申诉自动关联当前分销站点 ID
- 隔离查询与已读控制：列表、未读统计与批量已读均严格按站点隔离，防止主站与分站交叉泄漏
- 前台界面联动：消息中心通知 Tab 及移动端/PC端站内信页面展示分站专属标识与精准过滤

frontend/src/features/auth/views/NotificationsView.vue

@@ -9,7 +9,9 @@ import {
 } from '@/features/auth/api/notifications'
 import { notificationUnreadChangedEvent } from '@/features/auth/composables/useNotificationUnreadCount'
 import { formatDateTime } from '@/shared/utils/time'
+import { useDistributionSiteStore } from '@/stores/distributionSite'
 
+const distributionStore = useDistributionSiteStore()
 const loading = ref(false)
 const notifications = ref<NotificationItem[]>([])
 const currentPage = ref(1)
@@ -21,7 +23,8 @@ onMounted(loadNotifications)
 async function loadNotifications() {
   loading.value = true
   try {
-    const result = await fetchNotifications(currentPage.value, currentPageSize.value)
+    const siteCode = distributionStore.isDistribution ? distributionStore.siteCode : undefined
+    const result = await fetchNotifications(currentPage.value, currentPageSize.value, siteCode)
     notifications.value = result.items
     total.value = result.total
   } finally {
@@ -35,7 +38,8 @@ function handleSizeChange() {
 }
 
 async function markRead(id: number) {
-  await markNotificationRead(id)
+  const siteCode = distributionStore.isDistribution ? distributionStore.siteCode : undefined
+  await markNotificationRead(id, siteCode)
   window.dispatchEvent(new Event(notificationUnreadChangedEvent))
   ElMessage.success('已标记为已读')
   await loadNotifications()
@@ -45,12 +49,38 @@ async function markRead(id: number) {
 <template>
   <section class="page">
     <div class="page-header">
-      <p class="eyebrow">Notifications</p>
-      <h1>站内信</h1>
-      <p>接收审核、交接、归还、申诉和仲裁结果通知。</p>
+      <p class="eyebrow">
+        Notifications
+        <el-tag
+          v-if="distributionStore.isDistribution"
+          type="warning"
+          effect="light"
+          size="small"
+          class="distribution-site-tag"
+        >
+          {{ distributionStore.siteName }}专属分站
+        </el-tag>
+      </p>
+      <h1>
+        {{ distributionStore.isDistribution ? `${distributionStore.siteName} · 站内信` : '站内信' }}
+      </h1>
+      <p>
+        {{
+          distributionStore.isDistribution
+            ? `接收【${distributionStore.siteName}】专属分站订单交易、交接、申诉和客服通知。`
+            : '接收审核、交接、归还、申诉和仲裁结果通知。'
+        }}
+      </p>
     </div>
 
-    <el-empty v-if="!loading && notifications.length === 0" description="暂无站内信" />
+    <el-empty
+      v-if="!loading && notifications.length === 0"
+      :description="
+        distributionStore.isDistribution
+          ? `暂无【${distributionStore.siteName}】专属站内信`
+          : '暂无站内信'
+      "
+    />
     <div v-else v-loading="loading" class="notification-list">
       <div
         v-for="item in notifications"
@@ -91,3 +121,11 @@ async function markRead(id: number) {
     </div>
   </section>
 </template>
+
+<style scoped>
+.distribution-site-tag {
+  margin-left: 8px;
+  vertical-align: middle;
+  font-weight: 500;
+}
+</style>