feat: 前后端功能对齐 - 实现8个对齐差距

P0-1: 分类拖拽排序 - category-manage 添加拖拽 UI
P1-1: 反馈回复展示 - 新增 GET /feedback/mine + 前端我的反馈Tab
P1-2: 备份管理页面 - 新增下载端点 + backup-manage 页面
P2-1: 统计年度/周视图 - stats 支持 period 参数 + 前端维度切换器
P2-2: 数据导入 - 新增 POST /import 端点 + data-import 页面
P2-3: 数据导出服务端化 - 新增 GET /export 流式端点
P3-1: 健康检查展示 - health 移到 auth 前 + admin 状态卡片
P3-2~4: 交易标签系统 - tags CRUD + 交易关联 + 按标签筛选统计

后端: 新增 tag.ts/export.ts 路由, 改造 feedback/backup/transaction/stats
前端: 新增 DragSortList 组件, 3个新页面, 改造 7 个现有页面
QA 修复: 5个严重Bug + 4个潜在问题

client/src/pages/bills/index.vue

@@ -17,6 +17,25 @@
       </view>
     </view>
 
+    <!-- 标签筛选条 -->
+    <scroll-view class="tag-filter-scroll" scroll-x v-if="tagStore.tags.length > 0">
+      <view class="tag-filter-row">
+        <view class="tag-filter-chip" :class="{ active: filterTagId === null }" @tap="filterTagId = null; loadTx(true)">
+          <text class="tag-filter-text">全部标签</text>
+        </view>
+        <view
+          v-for="tag in tagStore.tags"
+          :key="tag.id"
+          class="tag-filter-chip"
+          :class="{ active: filterTagId === tag.id }"
+          @tap="filterTagId = tag.id; loadTx(true)"
+        >
+          <view class="tag-filter-dot" :style="{ background: tag.color }"></view>
+          <text class="tag-filter-text">{{ tag.name }}</text>
+        </view>
+      </view>
+    </scroll-view>
+
     <!-- 筛选结果统计 -->
     <view class="filter-stats" v-if="hasAdvancedFilter && !loading">
       <text class="filter-stats-text">共 {{ total }} 笔</text>
@@ -43,6 +62,8 @@
           :hideDate="true"
           :showCreator="groupStore.isGroupMode"
           :currentUserId="userStore.userInfo?.id"
+          :disableSwipe="groupStore.isGroupMode && item.user_id !== userStore.userInfo?.id"
+          :swipeHint="!swipeHintDismissed && isFirstDeletable(item)"
           @item-tap="onEdit(item)"
           @delete="onDelete(item)"
         />
@@ -91,6 +112,7 @@ import { ref, computed, onMounted } from 'vue'
 import { onShow, onReachBottom, onPullDownRefresh } from '@dcloudio/uni-app'
 import { useUserStore } from '@/stores/user'
 import { useGroupStore } from '@/stores/group'
+import { useTagStore } from '@/stores/tag'
 import { waitForReady } from '@/utils/app-ready'
 import { getTransactions, deleteTransaction } from '@/api/transaction'
 import TransactionItem from '@/components/TransactionItem/TransactionItem.vue'
@@ -104,8 +126,10 @@ import type { FilterParams } from '@/api/filter'
 
 const userStore = useUserStore()
 const groupStore = useGroupStore()
+const tagStore = useTagStore()
 const loading = ref(false)
 const filterType = ref('all')
+const filterTagId = ref<number | null>(null)
 const page = ref(1)
 const pageSize = 20
 const txList = ref<Transaction[]>([])
@@ -113,6 +137,35 @@ const total = ref(0)
 const loadError = ref(false)
 let loadSeq = 0 // 请求序号，防止并发覆盖
 
+// 左滑提示：只对首个可删除项显示一次，用户看过后不再重复
+const swipeHintDismissed = ref(false)
+const HINT_KEY = 'xiaocai_swipe_hint_shown'
+
+function isFirstDeletable(item: Transaction): boolean {
+  if (swipeHintDismissed.value) return false
+  // 群组模式下只有自己的记录可删除
+  if (groupStore.isGroupMode && item.user_id !== userStore.userInfo?.id) return false
+  // 找到第一个可删除的项
+  for (const group of groupedTx.value) {
+    for (const tx of group.items) {
+      if (groupStore.isGroupMode && tx.user_id !== userStore.userInfo?.id) continue
+      return tx.id === item.id
+    }
+  }
+  return false
+}
+
+// 动画播完后标记已显示
+try {
+  if (uni.getStorageSync(HINT_KEY)) {
+    swipeHintDismissed.value = true
+  }
+} catch {}
+setTimeout(() => {
+  swipeHintDismissed.value = true
+  try { uni.setStorageSync(HINT_KEY, '1') } catch {}
+}, 3000)
+
 // 高级筛选
 const showFilter = ref(false)
 const advancedFilters = ref<FilterParams>({})
@@ -145,6 +198,7 @@ const initialLoaded = ref(false)
 
 onMounted(async () => {
   await waitForReady()
+  tagStore.fetchTags().catch(() => {})
   loadTx(true).finally(() => { initialLoaded.value = true })
 })
 
@@ -174,6 +228,7 @@ async function loadTx(reset = false, silent = false) {
   if (af.minAmount) params.minAmount = af.minAmount
   if (af.maxAmount) params.maxAmount = af.maxAmount
   if (af.keyword) params.keyword = af.keyword
+  if (filterTagId.value) params.tagId = filterTagId.value
   try {
     loading.value = true
     loadError.value = false
@@ -379,4 +434,51 @@ onPullDownRefresh(() => {
 .state-text {
   @include state-text;
 }
+
+/* 标签筛选条 */
+.tag-filter-scroll {
+  white-space: nowrap;
+  padding: 0 $space-xl $space-sm;
+}
+
+.tag-filter-row {
+  display: inline-flex;
+  gap: $space-xs;
+}
+
+.tag-filter-chip {
+  display: inline-flex;
+  align-items: center;
+  gap: 8rpx;
+  padding: $space-xs $space-md;
+  background: $surface;
+  border-radius: $radius-lg;
+  border: 2rpx solid $border;
+  flex-shrink: 0;
+  transition: all $transition-normal;
+
+  &.active {
+    background: $primary-light;
+    border-color: $primary;
+  }
+
+  &:active { opacity: 0.7; }
+}
+
+.tag-filter-dot {
+  width: 16rpx;
+  height: 16rpx;
+  border-radius: 50%;
+  flex-shrink: 0;
+}
+
+.tag-filter-text {
+  font-size: $font-sm;
+  color: $text-sec;
+
+  .active & {
+    color: $primary;
+    font-weight: 500;
+  }
+}
 </style>