feat(任务模块): 任务归档 T-ARC-01~08 实现

- 数据: Project.autoArchive + Task.archived/archivedAt/archiveSource,
  迁移 20261026000000_task_archive (两索引)
- 领域: server/task-domain/archive.js —— hiddenAtOf 与保留口径精确同源,
  autoArchiveDue 到期判定, runAutoArchiveForProject (读时惰性) +
  runAutoArchiveSweep (每小时 cron 兜底)
- 接口: POST /tasks/:id/archive|unarchive (连带子任务, 幂等);
  GET /projects/:id/tasks/archived (keyword/kind/columnId/from/to 过滤,
  archivedAt+id 游标分页); 项目 PUT 收 autoArchive (枚举校验);
  主列表/子任务/项目 taskCount 全部排除归档
- 前端: ⋯ 菜单「归档」(确认含子任务条数); 项目栏「已归档」入口 →
  ArchivedTasks 弹层 (关键词/类型/列/归档时段过滤 + 加载更多 + 恢复/删除);
  项目管理「归档设置」四档 Picker

src/pages/task/ProjectView.jsx

@@ -9,6 +9,7 @@ import BoardView from './BoardView.jsx'
 import TaskDetail from './TaskDetail.jsx'
 import ProjectManage from './ProjectManage.jsx'
 import CopyTaskPopup from '../../components/task/CopyTaskPopup.jsx'
+import ArchivedTasks from './ArchivedTasks.jsx'
 
 // 项目视图容器: 列表 / 看板 切换 + 数据装载 + 乐观更新
 // 嵌在任务首屏下部 (T-VW-09); 头部仅保留「项目管理」与「+ 新增」(T-PJ-11)
@@ -23,6 +24,7 @@ export default function ProjectView({ projectId, onProjectChanged, onProjectExit
   const [adding, setAdding] = useState(false)
   const [tick, setTick] = useState(0) // 保留窗口重算触发
   const [copyTask, setCopyTask] = useState(null) // ⋯菜单触发的跨项目拷贝
+  const [archivedOpen, setArchivedOpen] = useState(false) // 已归档任务查询
 
   const load = useCallback(() => {
     setErr('')
@@ -169,6 +171,7 @@ export default function ProjectView({ projectId, onProjectChanged, onProjectExit
     const handler = ActionSheet.show({
       actions: [
         { text: '编辑', key: 'edit' },
+        { text: '归档', key: 'archive' },
         { text: '拷贝到其他项目', key: 'copy' },
         { text: '删除', key: 'delete', bold: true, danger: true },
       ],
@@ -176,6 +179,21 @@ export default function ProjectView({ projectId, onProjectChanged, onProjectExit
       onAction: async (item) => {
         handler.close?.()
         if (item.key === 'edit') setOpenTask(task)
+        else if (item.key === 'archive') {
+          const subs = task.children?.length || 0
+          const ok = await Dialog.confirm({
+            content: subs ? `归档「${task.title}」？将连带归档 ${subs} 条子任务。` : `归档「${task.title}」？`,
+            confirmText: '归档',
+          })
+          if (!ok) return
+          try {
+            await taskApi.archive(task.id)
+            Toast.show({ content: '已归档' })
+            load()
+          } catch (e) {
+            Toast.show({ content: e.message })
+          }
+        }
         else if (item.key === 'copy') setCopyTask(task)
         else if (item.key === 'delete') {
           const kids = task.children?.length || 0
@@ -225,6 +243,7 @@ export default function ProjectView({ projectId, onProjectChanged, onProjectExit
       <div className="navbar-sub task-projbar">
         <span className="title">{project.name}</span>
         <div className="right">
+          <span className="mini-btn" onClick={() => setArchivedOpen(true)}>已归档</span>
           <span className="mini-btn" onClick={() => setShowManage(true)}>项目管理</span>
           <span className="mini-btn solid" onClick={() => setAdding((v) => !v)}>+ 新增</span>
         </div>
@@ -301,6 +320,15 @@ export default function ProjectView({ projectId, onProjectChanged, onProjectExit
         />
       )}
 
+      {archivedOpen && (
+        <ArchivedTasks
+          project={project}
+          visible={archivedOpen}
+          onClose={() => setArchivedOpen(false)}
+          onChanged={load}
+        />
+      )}
+
       {showManage && (
         <ProjectManage
           project={project}