fix(mobile): 优化移动端表格、操作栏和弹窗显示

**问题描述**：
- 表格在移动端显示列过多，需要横向滚动，内容被截断
- 顶部操作栏按钮拥挤，占用过多空间
- 弹窗表单在小屏幕上布局不合理
- "更多"操作菜单定位错误，位置过高或超出屏幕
- 滚动页面时菜单不会自动关闭，与卡片分离

**解决方案**：

1. **DataTable 组件 - 移动端卡片视图**
   - 在 < 768px 时自动切换到卡片布局
   - 每个表格行渲染为独立卡片，所有字段清晰可见
   - 操作按钮在卡片底部，触摸目标足够大
   - 支持深色模式，包含加载和空状态
   - 自动应用于所有使用 DataTable 的管理页面

2. **UsersView 顶部操作栏优化**
   - 移动端：搜索框全宽 + 次要按钮显示为图标 + 创建按钮突出
   - 桌面端：保持原有布局（图标 + 文字）
   - 使用响应式 Tailwind classes

3. **UserCreateModal 弹窗优化**
   - 余额/并发数字段：移动端单列，桌面端双列
   - 弹窗边距：移动端 8px，桌面端 16px

4. **操作菜单定位修复**
   - UsersView: 移动端菜单居中对齐按钮，智能定位
   - AccountsView: 移动端菜单优先显示在按钮下方
   - 所有情况下确保菜单不超出屏幕边界
   - 添加滚动监听，滚动时自动关闭菜单

**影响范围**：
- 所有使用 DataTable 的管理页面（8 个页面）自动获得移动端卡片视图
- 用户管理和账号管理页面的操作菜单定位优化
- 创建用户弹窗的响应式布局优化

**技术要点**：
- 使用 Tailwind 响应式断点（md:, sm:）
- 触摸目标 ≥ 44px
- 完整支持深色模式
- 向后兼容，桌面端保持原有布局

frontend/src/components/admin/user/UserCreateModal.vue

@@ -25,7 +25,7 @@
         <label class="input-label">{{ t('admin.users.username') }}</label>
         <input v-model="form.username" type="text" class="input" :placeholder="t('admin.users.enterUsername')" />
       </div>
-      <div class="grid grid-cols-2 gap-4">
+      <div class="grid grid-cols-1 sm:grid-cols-2 gap-4">
         <div>
           <label class="input-label">{{ t('admin.users.columns.balance') }}</label>
           <input v-model.number="form.balance" type="number" step="any" class="input" />

frontend/src/components/common/DataTable.vue

@@ -1,7 +1,68 @@
 <template>
+  <div class="md:hidden space-y-3">
+    <template v-if="loading">
+      <div v-for="i in 5" :key="i" class="rounded-lg border border-gray-200 bg-white p-4 dark:border-dark-700 dark:bg-dark-900">
+        <div class="space-y-3">
+          <div v-for="column in columns.filter(c => c.key !== 'actions')" :key="column.key" class="flex justify-between">
+            <div class="h-4 w-20 animate-pulse rounded bg-gray-200 dark:bg-dark-700"></div>
+            <div class="h-4 w-32 animate-pulse rounded bg-gray-200 dark:bg-dark-700"></div>
+          </div>
+          <div v-if="hasActionsColumn" class="border-t border-gray-200 pt-3 dark:border-dark-700">
+            <div class="h-8 w-full animate-pulse rounded bg-gray-200 dark:bg-dark-700"></div>
+          </div>
+        </div>
+      </div>
+    </template>
+
+    <template v-else-if="!data || data.length === 0">
+      <div class="rounded-lg border border-gray-200 bg-white p-12 text-center dark:border-dark-700 dark:bg-dark-900">
+        <slot name="empty">
+          <div class="flex flex-col items-center">
+            <Icon
+              name="inbox"
+              size="xl"
+              class="mb-4 h-12 w-12 text-gray-400 dark:text-dark-500"
+            />
+            <p class="text-lg font-medium text-gray-900 dark:text-gray-100">
+              {{ t('empty.noData') }}
+            </p>
+          </div>
+        </slot>
+      </div>
+    </template>
+
+    <template v-else>
+      <div
+        v-for="(row, index) in sortedData"
+        :key="resolveRowKey(row, index)"
+        class="rounded-lg border border-gray-200 bg-white p-4 dark:border-dark-700 dark:bg-dark-900"
+      >
+        <div class="space-y-3">
+          <div
+            v-for="column in columns.filter(c => c.key !== 'actions')"
+            :key="column.key"
+            class="flex items-start justify-between gap-4"
+          >
+            <span class="text-xs font-medium uppercase tracking-wider text-gray-500 dark:text-dark-400">
+              {{ column.label }}
+            </span>
+            <div class="text-right text-sm text-gray-900 dark:text-gray-100">
+              <slot :name="`cell-${column.key}`" :row="row" :value="row[column.key]" :expanded="actionsExpanded">
+                {{ column.formatter ? column.formatter(row[column.key], row) : row[column.key] }}
+              </slot>
+            </div>
+          </div>
+          <div v-if="hasActionsColumn" class="border-t border-gray-200 pt-3 dark:border-dark-700">
+            <slot name="cell-actions" :row="row" :value="row['actions']" :expanded="actionsExpanded"></slot>
+          </div>
+        </div>
+      </div>
+    </template>
+  </div>
+
   <div
     ref="tableWrapperRef"
-    class="table-wrapper"
+    class="table-wrapper hidden md:block"
     :class="{
       'actions-expanded': actionsExpanded,
       'is-scrollable': isScrollable
@@ -277,7 +338,10 @@ const sortedData = computed(() => {
   })
 })
 
-// 检查第一列是否为勾选列
+const hasActionsColumn = computed(() => {
+  return props.columns.some(column => column.key === 'actions')
+})
+
 const hasSelectColumn = computed(() => {
   return props.columns.length > 0 && props.columns[0].key === 'select'
 })

frontend/src/style.css

@@ -345,7 +345,7 @@
   .modal-overlay {
     @apply fixed inset-0 z-50;
     @apply bg-black/50 backdrop-blur-sm;
-    @apply flex items-center justify-center p-4;
+    @apply flex items-center justify-center p-2 sm:p-4;
   }
 
   .modal-content {

frontend/src/views/admin/AccountsView.vue

@@ -120,7 +120,7 @@
 </template>
 
 <script setup lang="ts">
-import { ref, reactive, computed, onMounted } from 'vue'
+import { ref, reactive, computed, onMounted, onUnmounted } from 'vue'
 import { useI18n } from 'vue-i18n'
 import { useAppStore } from '@/stores/app'
 import { useAuthStore } from '@/stores/auth'
@@ -202,7 +202,56 @@ const cols = computed(() => {
 })
 
 const handleEdit = (a: Account) => { edAcc.value = a; showEdit.value = true }
-const openMenu = (a: Account, e: MouseEvent) => { menu.acc = a; menu.pos = { top: e.clientY, left: e.clientX - 200 }; menu.show = true }
+const openMenu = (a: Account, e: MouseEvent) => {
+  menu.acc = a
+
+  const target = e.currentTarget as HTMLElement
+  if (target) {
+    const rect = target.getBoundingClientRect()
+    const menuWidth = 200
+    const menuHeight = 240
+    const padding = 8
+    const viewportWidth = window.innerWidth
+    const viewportHeight = window.innerHeight
+
+    let left, top
+
+    if (viewportWidth < 768) {
+      // 居中显示,水平位置
+      left = Math.max(padding, Math.min(
+        rect.left + rect.width / 2 - menuWidth / 2,
+        viewportWidth - menuWidth - padding
+      ))
+
+      // 优先显示在按钮下方
+      top = rect.bottom + 4
+
+      // 如果下方空间不够,显示在上方
+      if (top + menuHeight > viewportHeight - padding) {
+        top = rect.top - menuHeight - 4
+        // 如果上方也不够,就贴在视口顶部
+        if (top < padding) {
+          top = padding
+        }
+      }
+    } else {
+      left = Math.max(padding, Math.min(
+        e.clientX - menuWidth,
+        viewportWidth - menuWidth - padding
+      ))
+      top = e.clientY
+      if (top + menuHeight > viewportHeight - padding) {
+        top = viewportHeight - menuHeight - padding
+      }
+    }
+
+    menu.pos = { top, left }
+  } else {
+    menu.pos = { top: e.clientY, left: e.clientX - 200 }
+  }
+
+  menu.show = true
+}
 const toggleSel = (id: number) => { const i = selIds.value.indexOf(id); if(i === -1) selIds.value.push(id); else selIds.value.splice(i, 1) }
 const selectPage = () => { selIds.value = [...new Set([...selIds.value, ...accounts.value.map(a => a.id)])] }
 const handleBulkDelete = async () => { if(!confirm(t('common.confirm'))) return; try { await Promise.all(selIds.value.map(id => adminAPI.accounts.delete(id))); selIds.value = []; reload() } catch (error) { console.error('Failed to bulk delete accounts:', error) } }
@@ -360,5 +409,14 @@ const isExpired = (value: number | null) => {
   return value * 1000 <= Date.now()
 }
 
-onMounted(async () => { load(); try { const [p, g] = await Promise.all([adminAPI.proxies.getAll(), adminAPI.groups.getAll()]); proxies.value = p; groups.value = g } catch (error) { console.error('Failed to load proxies/groups:', error) } })
+// 滚动时关闭菜单
+const handleScroll = () => {
+  menu.show = false
+}
+
+onMounted(async () => { load(); try { const [p, g] = await Promise.all([adminAPI.proxies.getAll(), adminAPI.groups.getAll()]); proxies.value = p; groups.value = g } catch (error) { console.error('Failed to load proxies/groups:', error) }; window.addEventListener('scroll', handleScroll, true) })
+
+onUnmounted(() => {
+  window.removeEventListener('scroll', handleScroll, true)
+})
 </script>

frontend/src/views/admin/UsersView.vue

@@ -3,11 +3,11 @@
     <TablePageLayout>
       <!-- Single Row: Search, Filters, and Actions -->
       <template #filters>
-        <div class="flex w-full flex-wrap-reverse items-center justify-between gap-4">
+        <div class="flex w-full flex-col gap-3 md:flex-row md:flex-wrap-reverse md:items-center md:justify-between md:gap-4">
           <!-- Left: Search + Active Filters -->
-          <div class="flex min-w-[280px] flex-1 flex-wrap content-start items-center gap-3">
+          <div class="flex min-w-[280px] flex-1 flex-wrap content-start items-center gap-3 md:order-1">
             <!-- Search Box -->
-            <div class="relative w-full sm:w-64">
+            <div class="relative w-full md:w-64">
               <Icon
                 name="search"
                 size="md"
@@ -100,109 +100,119 @@
           </div>
 
           <!-- Right: Actions and Settings -->
-          <div class="ml-auto flex max-w-full flex-wrap items-center justify-end gap-3">
-            <!-- Refresh Button -->
-            <button
-              @click="loadUsers"
-              :disabled="loading"
-              class="btn btn-secondary"
-              :title="t('common.refresh')"
-            >
-              <Icon name="refresh" size="md" :class="loading ? 'animate-spin' : ''" />
-            </button>
-            <!-- Filter Settings Dropdown -->
-            <div class="relative" ref="filterDropdownRef">
+          <div class="flex w-full items-center justify-between gap-2 md:order-2 md:ml-auto md:max-w-full md:flex-wrap md:justify-end md:gap-3">
+            <!-- Mobile: Secondary buttons (icon only) -->
+            <div class="flex items-center gap-2 md:contents">
+              <!-- Refresh Button -->
               <button
-                @click="showFilterDropdown = !showFilterDropdown"
-                class="btn btn-secondary"
+                @click="loadUsers"
+                :disabled="loading"
+                class="btn btn-secondary px-2 md:px-3"
+                :title="t('common.refresh')"
               >
-                <Icon name="filter" size="sm" class="mr-1.5" />
-                {{ t('admin.users.filterSettings') }}
+                <Icon name="refresh" size="md" :class="loading ? 'animate-spin' : ''" />
               </button>
-              <!-- Dropdown menu -->
-              <div
-                v-if="showFilterDropdown"
-                class="absolute right-0 top-full z-50 mt-1 w-48 rounded-lg border border-gray-200 bg-white py-1 shadow-lg dark:border-dark-600 dark:bg-dark-800"
-              >
-                <!-- Built-in filters -->
+              <!-- Filter Settings Dropdown -->
+              <div class="relative" ref="filterDropdownRef">
                 <button
-                  v-for="filter in builtInFilters"
-                  :key="filter.key"
-                  @click="toggleBuiltInFilter(filter.key)"
-                  class="flex w-full items-center justify-between px-4 py-2 text-left text-sm text-gray-700 hover:bg-gray-100 dark:text-gray-300 dark:hover:bg-dark-700"
+                  @click="showFilterDropdown = !showFilterDropdown"
+                  class="btn btn-secondary px-2 md:px-3"
+                  :title="t('admin.users.filterSettings')"
                 >
-                  <span>{{ filter.name }}</span>
-                  <Icon
-                    v-if="visibleFilters.has(filter.key)"
-                    name="check"
-                    size="sm"
-                    class="text-primary-500"
-                    :stroke-width="2"
-                  />
+                  <Icon name="filter" size="sm" class="md:mr-1.5" />
+                  <span class="hidden md:inline">{{ t('admin.users.filterSettings') }}</span>
                 </button>
-                <!-- Divider if custom attributes exist -->
+                <!-- Dropdown menu -->
                 <div
-                  v-if="filterableAttributes.length > 0"
-                  class="my-1 border-t border-gray-100 dark:border-dark-700"
-                ></div>
-                <!-- Custom attribute filters -->
-                <button
-                  v-for="attr in filterableAttributes"
-                  :key="attr.id"
-                  @click="toggleAttributeFilter(attr)"
-                  class="flex w-full items-center justify-between px-4 py-2 text-left text-sm text-gray-700 hover:bg-gray-100 dark:text-gray-300 dark:hover:bg-dark-700"
+                  v-if="showFilterDropdown"
+                  class="absolute right-0 top-full z-50 mt-1 w-48 rounded-lg border border-gray-200 bg-white py-1 shadow-lg dark:border-dark-600 dark:bg-dark-800"
                 >
-                  <span>{{ attr.name }}</span>
-                  <Icon
-                    v-if="visibleFilters.has(`attr_${attr.id}`)"
-                    name="check"
-                    size="sm"
-                    class="text-primary-500"
-                    :stroke-width="2"
-                  />
-                </button>
+                  <!-- Built-in filters -->
+                  <button
+                    v-for="filter in builtInFilters"
+                    :key="filter.key"
+                    @click="toggleBuiltInFilter(filter.key)"
+                    class="flex w-full items-center justify-between px-4 py-2 text-left text-sm text-gray-700 hover:bg-gray-100 dark:text-gray-300 dark:hover:bg-dark-700"
+                  >
+                    <span>{{ filter.name }}</span>
+                    <Icon
+                      v-if="visibleFilters.has(filter.key)"
+                      name="check"
+                      size="sm"
+                      class="text-primary-500"
+                      :stroke-width="2"
+                    />
+                  </button>
+                  <!-- Divider if custom attributes exist -->
+                  <div
+                    v-if="filterableAttributes.length > 0"
+                    class="my-1 border-t border-gray-100 dark:border-dark-700"
+                  ></div>
+                  <!-- Custom attribute filters -->
+                  <button
+                    v-for="attr in filterableAttributes"
+                    :key="attr.id"
+                    @click="toggleAttributeFilter(attr)"
+                    class="flex w-full items-center justify-between px-4 py-2 text-left text-sm text-gray-700 hover:bg-gray-100 dark:text-gray-300 dark:hover:bg-dark-700"
+                  >
+                    <span>{{ attr.name }}</span>
+                    <Icon
+                      v-if="visibleFilters.has(`attr_${attr.id}`)"
+                      name="check"
+                      size="sm"
+                      class="text-primary-500"
+                      :stroke-width="2"
+                    />
+                  </button>
+                </div>
               </div>
-            </div>
-            <!-- Column Settings Dropdown -->
-            <div class="relative" ref="columnDropdownRef">
+              <!-- Column Settings Dropdown -->
+              <div class="relative" ref="columnDropdownRef">
+                <button
+                  @click="showColumnDropdown = !showColumnDropdown"
+                  class="btn btn-secondary px-2 md:px-3"
+                  :title="t('admin.users.columnSettings')"
+                >
+                  <svg class="h-4 w-4 md:mr-1.5" fill="none" stroke="currentColor" viewBox="0 0 24 24" stroke-width="1.5">
+                    <path stroke-linecap="round" stroke-linejoin="round" d="M9 4.5v15m6-15v15m-10.875 0h15.75c.621 0 1.125-.504 1.125-1.125V5.625c0-.621-.504-1.125-1.125-1.125H4.125C3.504 4.5 3 5.004 3 5.625v12.75c0 .621.504 1.125 1.125 1.125z" />
+                  </svg>
+                  <span class="hidden md:inline">{{ t('admin.users.columnSettings') }}</span>
+                </button>
+                <!-- Dropdown menu -->
+                <div
+                  v-if="showColumnDropdown"
+                  class="absolute right-0 top-full z-50 mt-1 max-h-80 w-48 overflow-y-auto rounded-lg border border-gray-200 bg-white py-1 shadow-lg dark:border-dark-600 dark:bg-dark-800"
+                >
+                  <button
+                    v-for="col in toggleableColumns"
+                    :key="col.key"
+                    @click="toggleColumn(col.key)"
+                    class="flex w-full items-center justify-between px-4 py-2 text-left text-sm text-gray-700 hover:bg-gray-100 dark:text-gray-300 dark:hover:bg-dark-700"
+                  >
+                    <span>{{ col.label }}</span>
+                    <Icon
+                      v-if="isColumnVisible(col.key)"
+                      name="check"
+                      size="sm"
+                      class="text-primary-500"
+                      :stroke-width="2"
+                    />
+                  </button>
+                </div>
+              </div>
+              <!-- Attributes Config Button -->
               <button
-                @click="showColumnDropdown = !showColumnDropdown"
-                class="btn btn-secondary"
+                @click="showAttributesModal = true"
+                class="btn btn-secondary px-2 md:px-3"
+                :title="t('admin.users.attributes.configButton')"
               >
-                <svg class="mr-1.5 h-4 w-4" fill="none" stroke="currentColor" viewBox="0 0 24 24" stroke-width="1.5">
-                  <path stroke-linecap="round" stroke-linejoin="round" d="M9 4.5v15m6-15v15m-10.875 0h15.75c.621 0 1.125-.504 1.125-1.125V5.625c0-.621-.504-1.125-1.125-1.125H4.125C3.504 4.5 3 5.004 3 5.625v12.75c0 .621.504 1.125 1.125 1.125z" />
-                </svg>
-                {{ t('admin.users.columnSettings') }}
+                <Icon name="cog" size="sm" class="md:mr-1.5" />
+                <span class="hidden md:inline">{{ t('admin.users.attributes.configButton') }}</span>
               </button>
-              <!-- Dropdown menu -->
-              <div
-                v-if="showColumnDropdown"
-                class="absolute right-0 top-full z-50 mt-1 max-h-80 w-48 overflow-y-auto rounded-lg border border-gray-200 bg-white py-1 shadow-lg dark:border-dark-600 dark:bg-dark-800"
-              >
-                <button
-                  v-for="col in toggleableColumns"
-                  :key="col.key"
-                  @click="toggleColumn(col.key)"
-                  class="flex w-full items-center justify-between px-4 py-2 text-left text-sm text-gray-700 hover:bg-gray-100 dark:text-gray-300 dark:hover:bg-dark-700"
-                >
-                  <span>{{ col.label }}</span>
-                  <Icon
-                    v-if="isColumnVisible(col.key)"
-                    name="check"
-                    size="sm"
-                    class="text-primary-500"
-                    :stroke-width="2"
-                  />
-                </button>
-              </div>
             </div>
-            <!-- Attributes Config Button -->
-            <button @click="showAttributesModal = true" class="btn btn-secondary">
-              <Icon name="cog" size="sm" class="mr-1.5" />
-              {{ t('admin.users.attributes.configButton') }}
-            </button>
-            <!-- Create User Button -->
-            <button @click="showCreateModal = true" class="btn btn-primary">
+
+            <!-- Create User Button (full width on mobile, auto width on desktop) -->
+            <button @click="showCreateModal = true" class="btn btn-primary flex-1 md:flex-initial">
               <Icon name="plus" size="md" class="mr-2" />
               {{ t('admin.users.createUser') }}
             </button>
@@ -757,15 +767,29 @@ const openActionMenu = (user: User) => {
       const padding = 8
       const viewportWidth = window.innerWidth
       const viewportHeight = window.innerHeight
-      const left = Math.min(
-        Math.max(rect.right - menuWidth, padding),
-        Math.max(viewportWidth - menuWidth - padding, padding)
-      )
-      let top = rect.bottom + 4
-      if (top + menuHeight > viewportHeight - padding) {
-        top = Math.max(rect.top - menuHeight - 4, padding)
+
+      let left, top
+
+      if (viewportWidth < 768) {
+        left = Math.max(padding, Math.min(
+          rect.left + rect.width / 2 - menuWidth / 2,
+          viewportWidth - menuWidth - padding
+        ))
+        top = rect.top - menuHeight - 4
+        if (top < padding) {
+          top = rect.bottom + 4
+        }
+      } else {
+        left = Math.min(
+          Math.max(rect.right - menuWidth, padding),
+          Math.max(viewportWidth - menuWidth - padding, padding)
+        )
+        top = rect.bottom + 4
+        if (top + menuHeight > viewportHeight - padding) {
+          top = Math.max(rect.top - menuHeight - 4, padding)
+        }
       }
-      // Position menu near the trigger, clamped to viewport
+
       menuPosition.value = {
         top,
         left
@@ -1054,16 +1078,24 @@ const closeBalanceModal = () => {
   showBalanceModal.value = false
   balanceUser.value = null
 }
+
+// 滚动时关闭菜单
+const handleScroll = () => {
+  closeActionMenu()
+}
+
 onMounted(async () => {
   await loadAttributeDefinitions()
   loadSavedFilters()
   loadSavedColumns()
   loadUsers()
   document.addEventListener('click', handleClickOutside)
+  window.addEventListener('scroll', handleScroll, true)
 })
 
 onUnmounted(() => {
   document.removeEventListener('click', handleClickOutside)
+  window.removeEventListener('scroll', handleScroll, true)
   clearTimeout(searchTimeout)
   abortController?.abort()
 })