feat(admin): 统一用户单元格，展示游客设备号与客户端系统

- 新增 AppUserCell，游客显示标签+deviceId，第二行统一展示系统与机型
- 收藏、点赞、观看记录三页复用，观看记录去掉重复的系统列

src/views/components/AppUserCell.vue

@@ -0,0 +1,63 @@
+<!-- Author: fruit.com.cn -->
+
+<script setup>
+import { computed } from 'vue'
+
+/**
+ * 后台各列表共用的「用户」单元格。
+ *
+ * 口径：已登录显示昵称 + uid；未登录显示「游客」标签 + deviceId（单行省略，悬浮看全值）。
+ * 第二行统一展示客户端系统，系统缺失（老客户端没上报）时显示横线。
+ */
+const props = defineProps({
+  row: { type: Object, required: true }
+})
+
+const PLATFORM_TEXT = { ANDROID: 'Android', IOS: 'iOS', WEB: 'Web' }
+
+const isGuest = computed(() => props.row?.userId == null)
+
+const systemText = computed(() => {
+  const row = props.row || {}
+  const name = PLATFORM_TEXT[row.platform] || row.platform || ''
+  const version = row.osVersion || ''
+  const text = `${name} ${version}`.trim()
+  if (!text) return '—'
+  return row.deviceModel ? `${text} · ${row.deviceModel}` : text
+})
+</script>
+
+<template>
+  <div class="app-user-meta">
+    <template v-if="isGuest">
+      <el-tag type="info" size="small">游客</el-tag>
+      <span class="app-user-uid app-user-device" :title="row.deviceId || ''">{{
+        row.deviceId || '—'
+      }}</span>
+    </template>
+    <template v-else>
+      <span class="app-user-name" :title="row.nickname || ''">{{
+        row.nickname || '未设置昵称'
+      }}</span>
+      <span class="app-user-uid">{{ row.uid || `用户 #${row.userId}` }}</span>
+    </template>
+    <span class="app-user-system">{{ systemText }}</span>
+  </div>
+</template>
+
+<style scoped>
+.app-user-device {
+  max-width: 150px;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+
+.app-user-system {
+  color: #b0adbd;
+  font-size: 12px;
+  overflow: hidden;
+  text-overflow: ellipsis;
+  white-space: nowrap;
+}
+</style>