fix(intelligent-eval): task queue pagination + column widths align with eval list

任务队列页对齐评估列表：
- 分页：始终显示（pageSize 10 + showSizeChanger + showTotal），此前仅在
  >10 条时显示导致 t480（8 条）无分页器
- 列宽重新分配：评估列 230→300（长名称不截断）、原因列固定 240（ellipsis）、
  入队/完成时间 170、队列状态 100、优先级 80
- 字体格式对齐评估列表：去掉 size="middle" 改用默认（与评估列表一致）
tsc 0 错误 vitest 16 passed

frontend/web/src/components/intelligent_eval/TaskQueueMonitor.tsx

@@ -67,11 +67,11 @@ export default function TaskQueueMonitor() {
 
   const columns: ColumnsType<TaskQueueItem> = [
     {
-      title: '入队时间', dataIndex: 'created_at', key: 'created_at', width: 165,
+      title: '入队时间', dataIndex: 'created_at', key: 'created_at', width: 170,
       render: (v: string | null) => (v ? formatDateTime(v) : '—'),
     },
     {
-      title: '评估', key: 'eval', width: 230, ellipsis: true,
+      title: '评估', key: 'eval', width: 300, ellipsis: true,
       render: (_, t) => (
         <Space size={6}>
           <span style={{ fontWeight: 500 }}>{t.eval_name ?? t.eval_id.slice(0, 8)}</span>
@@ -84,22 +84,22 @@ export default function TaskQueueMonitor() {
       ),
     },
     {
-      title: '队列状态', dataIndex: 'status', key: 'status', width: 96,
+      title: '队列状态', dataIndex: 'status', key: 'status', width: 100,
       render: (s: TaskQueueStatus) => {
         const meta = STATUS_META[s]
         return <Tag color={meta.color}>{meta.label}</Tag>
       },
     },
     {
-      title: '优先级', dataIndex: 'priority', key: 'priority', width: 76,
+      title: '优先级', dataIndex: 'priority', key: 'priority', width: 80,
       render: (p: number) => <Tag>{p}</Tag>,
     },
     {
-      title: '原因', dataIndex: 'reason', key: 'reason', ellipsis: true,
+      title: '原因', dataIndex: 'reason', key: 'reason', width: 240, ellipsis: true,
       render: (r: string) => <Tooltip title={r}><span>{r}</span></Tooltip>,
     },
     {
-      title: '完成时间', dataIndex: 'completed_at', key: 'completed_at', width: 165,
+      title: '完成时间', dataIndex: 'completed_at', key: 'completed_at', width: 170,
       render: (v: string | null, t) => {
         if (t.status === 'failed' && t.error) {
           return <Tooltip title={t.error}><span style={{ color: statusColors.failed }}>失败</span></Tooltip>
@@ -131,11 +131,15 @@ export default function TaskQueueMonitor() {
         <div style={{ height: 'calc(100% - 44px)', overflowY: 'auto' }}>
           <Table
             rowKey="id"
-            size="middle"
             loading={loading}
             dataSource={tasks ?? []}
             columns={columns}
-            pagination={(tasks?.length ?? 0) > 10 ? { pageSize: 10, showTotal: (t) => `共 ${t} 条` } : false}
+            pagination={{
+              pageSize: 10,
+              showSizeChanger: true,
+              pageSizeOptions: [10, 20, 50],
+              showTotal: (t) => `共 ${t} 条`,
+            }}
             locale={{ emptyText: <Empty description="暂无任务" /> }}
           />
         </div>