refactor:[FL-11][将卡片操作按钮移至右上角]

- 将编辑、删除、三个点按钮从卡片底部移至右上角
- 使用 Card 组件的 extra 属性放置按钮
- 移除底部的 admin-users-user-card-actions 区域

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Co-authored-by: multica-agent <github@multica.ai>

web/src/app/admin/users/page.tsx

@@ -891,6 +891,37 @@ export default function AdminUsersPage() {
             </Tag>
           </Space>
         }
+        extra={
+          <Space size={4}>
+            <Button
+              type="text"
+              size="small"
+              disabled={rowBusy}
+              icon={<EditOutlined />}
+              onClick={() => openEditUserModal(userItem)}
+            />
+            <Popconfirm
+              title={`确认删除用户 ${userItem.username}（${userItem.id}）？`}
+              okText="删除"
+              cancelText="取消"
+              okButtonProps={{ danger: true, loading: deleteLoading }}
+              onConfirm={() => deleteUserMutation.mutate(userItem.id)}
+              disabled={rowBusy}
+            >
+              <Button
+                type="text"
+                danger
+                size="small"
+                icon={<DeleteOutlined />}
+                loading={deleteLoading}
+                disabled={rowBusy}
+              />
+            </Popconfirm>
+            <Dropdown menu={{ items: moreMenuItems }} trigger={["click"]}>
+              <Button type="text" size="small" disabled={rowBusy} icon={<MoreOutlined />} />
+            </Dropdown>
+          </Space>
+        }
       >
         <Space direction="vertical" size={10} style={{ width: "100%" }}>
           <div className="admin-users-user-card-field">
@@ -917,37 +948,6 @@ export default function AdminUsersPage() {
               {userItem.email || "-"}
             </Typography.Text>
           </div>
-          <div className="admin-users-user-card-actions" style={{ display: "flex", justifyContent: "flex-end" }}>
-            <Space size={4}>
-              <Button
-                type="text"
-                size="small"
-                disabled={rowBusy}
-                icon={<EditOutlined />}
-                onClick={() => openEditUserModal(userItem)}
-              />
-              <Popconfirm
-                title={`确认删除用户 ${userItem.username}（${userItem.id}）？`}
-                okText="删除"
-                cancelText="取消"
-                okButtonProps={{ danger: true, loading: deleteLoading }}
-                onConfirm={() => deleteUserMutation.mutate(userItem.id)}
-                disabled={rowBusy}
-              >
-                <Button
-                  type="text"
-                  danger
-                  size="small"
-                  icon={<DeleteOutlined />}
-                  loading={deleteLoading}
-                  disabled={rowBusy}
-                />
-              </Popconfirm>
-              <Dropdown menu={{ items: moreMenuItems }} trigger={["click"]}>
-                <Button type="text" size="small" disabled={rowBusy} icon={<MoreOutlined />} />
-              </Dropdown>
-            </Space>
-          </div>
         </Space>
       </AntCard>
     );