fix: 部员详情累计时长卡与下方活动列表合计不一致

- server/users.ts GET /:id：
  · total_hours 原先是标量子查询（独立的 SELECT SUM FROM hours），
    活动列表是 JOIN activities 后查出来的——两者在某些边界下可能
    数据源不一致（FK pragma 状态、活动被删但 hours 残留时标量子
    查询会多算 1 次，卡片显示 11h 而列表只有 7h 就是这个问题）
  · 改为直接用 activities 列表查询结果 reduce 求和后赋值给
    user.total_hours，保证两个数字来自完全同一份数据
- client/Users.tsx 部员详情参与活动表：
  · 表底部新增一条粘性合计行：bg-primary-50/60 + 边框，左边小字
    『本页列表合计（应等于上方卡片的累计时长）』，右边大号加粗
    主题色数字实时显示 reduce 求和
  · 溢出容器 overflow-hidden，合计行与 DataTable 边框完美贴合无缝

client/src/pages/admin/Users.tsx

@@ -749,49 +749,61 @@ export default function Users() {
               <h3 className="font-semibold mb-2 text-gray-800">
                 参与的活动（{detail.activities.length} 次）<span className="ml-2 text-xs font-normal muted">按登记时间倒序，最新补录/登记在最上方</span>
               </h3>
-              <DataTable
+              <div className="overflow-hidden">
-                columns={[
+                <DataTable
-                  {
+                  columns={[
-                    key: 'title',
+                    {
-                    title: '活动名称',
+                      key: 'title',
-                    width: '30%',
+                      title: '活动名称',
-                    render: (r: any) => (
+                      width: '30%',
-                      <div className="font-medium leading-snug break-words max-w-[280px]">{r.title}</div>
+                      render: (r: any) => (
-                    ),
+                        <div className="font-medium leading-snug break-words max-w-[280px]">{r.title}</div>
-                  },
+                      ),
-                  {
+                    },
-                    key: 'time',
+                    {
-                    title: '活动时间',
+                      key: 'time',
-                    width: '240px',
+                      title: '活动时间',
-                    render: (r: any) => (
+                      width: '240px',
-                      <div className="text-xs font-mono tracking-wide leading-snug whitespace-nowrap pl-3 pr-2 text-gray-700 text-left">
+                      render: (r: any) => (
-                        {formatDateRange(r.start_time, r.end_time)}
+                        <div className="text-xs font-mono tracking-wide leading-snug whitespace-nowrap pl-3 pr-2 text-gray-700 text-left">
-                      </div>
+                          {formatDateRange(r.start_time, r.end_time)}
-                    ),
+                        </div>
-                  },
+                      ),
-                  {
+                    },
-                    key: 'hours',
+                    {
-                    title: '时长',
+                      key: 'hours',
-                    width: '100px',
+                      title: '时长',
-                    render: (r: any) => (
+                      width: '100px',
-                      <span className="font-semibold text-primary-600 text-center block w-full text-sm">
+                      render: (r: any) => (
-                        {Number(r.hours || 0).toFixed(1)}h
+                        <span className="font-semibold text-primary-600 text-center block w-full text-sm">
-                      </span>
+                          {Number(r.hours || 0).toFixed(1)}h
-                    ),
+                        </span>
-                  },
+                      ),
-                  {
+                    },
-                    key: 'remark',
+                    {
-                    title: '备注',
+                      key: 'remark',
-                    render: (r: any) => (
+                      title: '备注',
-                      <div className="leading-relaxed break-words text-gray-700 pr-2">
+                      render: (r: any) => (
-                        {r.remark || <span className="muted">—</span>}
+                        <div className="leading-relaxed break-words text-gray-700 pr-2">
-                      </div>
+                          {r.remark || <span className="muted">—</span>}
-                    ),
+                        </div>
-                  },
+                      ),
-                ]}
+                    },
-                data={detail.activities}
+                  ]}
-                rowKey={(r: any) => `${r.id}-${r.reg_at || r.hours}-${r.remark || ''}`}
+                  data={detail.activities}
-              />
+                  rowKey={(r: any) => `${r.id}-${r.reg_at || r.hours}-${r.remark || ''}`}
+                />
+                {detail.activities.length > 0 && (
+                  <div className="mt-1 px-3 py-2.5 rounded-b-md border-t border-gray-200 bg-primary-50/60 flex items-center justify-between">
+                    <div className="text-sm font-medium text-gray-700">
+                      本页列表合计 <span className="text-gray-500 text-xs ml-1">（应等于上方卡片的累计时长）</span>
+                    </div>
+                    <div className="text-lg font-bold text-primary-700">
+                      {detail.activities.reduce((s: number, r: any) => s + Number(r.hours || 0), 0).toFixed(1)}h
+                    </div>
+                  </div>
+                )}
+              </div>
             </div>
           </div>
         )}

server/src/routes/users.ts

@@ -82,6 +82,8 @@ router.get('/:id', (req: Request, res: Response) => {
     WHERE h.user_id = ?
     ORDER BY h.created_at DESC, a.start_time DESC
   `).all(id);
+  const listSum = activities.reduce((s, r) => s + Number(r.hours || 0), 0);
+  user.total_hours = Number(listSum.toFixed(1));
   res.json({ ...user, activities });
 });