feat(V0.2): 任务模块 —— 项目 / 列表与看板 / 列-状态绑定 / 一级子任务

需求 142 条 (T-*), 设计见 docs/V0.2/任务模块/

数据层:
- 新增 6 张表: Project / ProjectMember / BoardColumn / Task / TaskMember / TaskTag
- 看板列是实体(可增删改排序), Task.columnId 外键 RESTRICT 防误删列丢任务
- Task.status(todo/doing/done) 与 columnId 双落库, 二者正交

领域层 server/task-domain/ (唯一口径, 前后端不重复实现):
- resolveStatus: 列决定状态(只看目标列, 无拖出回退); 状态与列不匹配时按列序取第一个绑定该状态的列自动归位, 无匹配列则不移动; 子任务完全豁免
- retention: 逐列 6 档保留窗口(永不显示/当天/3天/本周/本月/永久显示), 以 doneAt 判定
- copyTask: 跨项目深拷贝, 人员按目标项目成员过滤并回报丢弃名单

接口: /api/projects, /api/columns, /api/tasks (均校验项目成员)

前端:
- 底部 Tab 插入「任务」, 位于「打卡」之后; 默认首页仍为打卡
- 列表视图(子任务缩进+折叠) / 看板视图(长按拖拽换列、拖到卡片降为子任务)
- 列设置(列管理+状态绑定+保留选项) / 任务详情(扩展信息卡片默认收起) / 成员管理
- 视图记忆与上次项目存设备端

已验证: 95 文件语法 0 错误、相对导入 0 缺失、领域逻辑用例全部通过

src/styles/globals.css

@@ -883,3 +883,216 @@ body.me-safe-top .app-safe-top { height: 0; }
 .mv-sheet-row.danger { color: var(--color-danger); }
 .mv-sheet-row.disabled { opacity: .45; cursor: default; }
 .mv-sheet-row .k { font-size: 11px; color: #b8bcc4; }
+
+/* ================== 任务模块 (V0.2, 需求 T-*) ================== */
+/* 项目列表 / 列表视图 / 看板视图 / 列设置 / 任务详情 / 成员 */
+.task-content { flex: 1 1 auto; min-height: 0; display: flex; flex-direction: column; overflow-y: auto; }
+.task-content.is-board { overflow: hidden; }
+
+/* ---- 项目列表 ---- */
+.proj-head { display: flex; align-items: center; padding: 12px 14px 8px; }
+.proj-head b { font-size: 16px; }
+.proj-head .right { margin-left: auto; display: flex; gap: 6px; }
+.proj-group { font-size: 11px; color: #b8bcc4; letter-spacing: .5px; padding: 10px 16px 6px; }
+.proj-item {
+  display: flex; align-items: center; gap: 12px; background: #fff; border-radius: 10px;
+  padding: 13px 14px; margin: 0 12px 8px; box-shadow: 0 1px 2px rgba(0,0,0,.04); cursor: pointer;
+}
+.proj-item .pico {
+  width: 34px; height: 34px; border-radius: 9px; display: flex; align-items: center;
+  justify-content: center; color: #fff; font-size: 14px; font-weight: 700; flex-shrink: 0;
+}
+.proj-item .pmain { flex: 1; min-width: 0; }
+.proj-item .ptitle { font-size: 14.5px; font-weight: 600; display: flex; align-items: center; gap: 6px; }
+.proj-item .psub { font-size: 11.5px; color: var(--color-muted); margin-top: 2px; }
+.proj-item .pcount { font-size: 15px; color: #c0c4cc; flex-shrink: 0; }
+.badge { font-size: 10px; color: #ad6800; background: #fff7e6; border-radius: 4px; padding: 0 5px; font-weight: 400; }
+
+/* ---- 视图头部 / 快速新增 ---- */
+.pv-head { padding: 10px 14px 8px; display: flex; align-items: center; gap: 10px; flex-shrink: 0; }
+.pv-head .seg { display: flex; background: #f2f3f5; border-radius: 8px; padding: 3px; width: 112px; }
+.pv-head .seg div { flex: 1; text-align: center; font-size: 13px; padding: 5px 0; border-radius: 6px; color: var(--color-muted); cursor: pointer; }
+.pv-head .seg div.on { background: #fff; color: var(--color-text); font-weight: 600; box-shadow: 0 1px 2px rgba(0,0,0,.06); }
+.pv-head .right { margin-left: auto; display: flex; gap: 6px; }
+.mini-btn {
+  font-size: 11px; border: 1px solid var(--color-primary); color: var(--color-primary);
+  border-radius: 999px; padding: 3px 10px; background: #fff; white-space: nowrap; cursor: pointer;
+}
+.mini-btn.solid { background: var(--color-primary); color: #fff; }
+.mini-btn.grey { border-color: #dcdcdc; color: var(--color-muted); }
+.quick-add { padding: 0 12px 8px; flex-shrink: 0; }
+
+/* ---- 列表视图 ---- */
+.list-body { flex: 1 1 auto; min-height: 0; overflow-y: auto; padding-bottom: 16px; }
+.group-title { display: flex; align-items: center; gap: 7px; padding: 12px 16px 6px; font-size: 12px; color: var(--color-muted); font-weight: 600; }
+.group-title::before { content: ""; width: 3px; height: 12px; border-radius: 2px; background: var(--color-primary); }
+.group-title .cnt { color: #b8bcc4; font-weight: 400; }
+.task-row {
+  display: flex; align-items: flex-start; gap: 9px; background: #fff; border-radius: 9px;
+  padding: 10px 12px; margin: 0 12px 7px; box-shadow: 0 1px 2px rgba(0,0,0,.04); cursor: pointer;
+}
+.task-row.done { background: #fafbfa; }
+.task-row .box, .sub-row .box {
+  width: 19px; height: 19px; border-radius: 50%; border: 1.5px solid #d0d0d0;
+  display: flex; align-items: center; justify-content: center; flex-shrink: 0; margin-top: 1px; cursor: pointer;
+}
+.task-row.done .box, .sub-row.done .box { background: #00b578; border-color: #00b578; }
+.box svg { opacity: 0; }
+.task-row.done .box svg, .sub-row.done .box svg { opacity: 1; }
+.task-main { flex: 1; min-width: 0; }
+.task-title { font-size: 14px; display: flex; align-items: center; gap: 6px; word-break: break-word; }
+.task-row.done .task-title { color: #a0a0a0; text-decoration: line-through; }
+.task-meta { display: flex; align-items: center; gap: 7px; margin-top: 4px; font-size: 11px; color: #999; flex-wrap: wrap; }
+.task-meta .col { color: var(--color-primary); background: #f0f5ff; border-radius: 4px; padding: 0 5px; }
+.task-meta .assignee { font-size: 12px; font-weight: 600; color: var(--color-text); }
+.task-meta .assignee.none { color: #b8bcc4; font-weight: 400; }
+.task-meta .members { font-size: 10.5px; color: #a7adb6; }
+.task-right { display: flex; align-items: center; flex-shrink: 0; }
+.more { color: #c2c7cf; font-size: 16px; line-height: 1; padding: 0 2px; cursor: pointer; }
+.sub-row {
+  display: flex; align-items: center; gap: 8px; background: #fff; border-radius: 8px;
+  padding: 8px 12px 8px 30px; margin: -2px 12px 7px 26px; box-shadow: 0 1px 2px rgba(0,0,0,.03);
+  position: relative; cursor: pointer;
+}
+.sub-row::before { content: ""; position: absolute; left: 14px; top: 0; bottom: 0; width: 1px; background: #e9ecf0; }
+.sub-row .box { width: 16px; height: 16px; }
+.sub-title { flex: 1; font-size: 13px; color: #444; }
+.sub-row.done .sub-title { color: #a8a8a8; text-decoration: line-through; }
+.collapse { font-size: 11px; color: var(--color-primary); padding: 2px 0 8px 30px; margin: 0 12px; cursor: pointer; }
+.sub-add-hint { font-size: 11px; color: #b8bcc4; padding: 0 0 8px 44px; cursor: pointer; }
+
+/* ---- 状态点 ---- */
+.sdot { width: 8px; height: 8px; border-radius: 50%; display: inline-block; flex-shrink: 0; }
+.sdot.todo { background: #c9ced6; }
+.sdot.doing { background: #1677ff; }
+.sdot.done { background: #00b578; }
+.sdot.pill { width: auto; height: auto; border-radius: 999px; font-size: 10px; padding: 0 6px; line-height: 15px; color: #fff; }
+.sdot.pill.todo { background: #a8b0ba; }
+.sdot.pill.doing { background: #1677ff; }
+.sdot.pill.done { background: #00b578; }
+
+/* ---- 看板视图 ---- */
+.board-wrap {
+  display: flex; gap: 10px; padding: 0 12px 8px; overflow-x: auto; overflow-y: hidden;
+  flex: 1 1 auto; min-height: 0; align-items: stretch;
+}
+.bcol { flex: 0 0 186px; display: flex; flex-direction: column; min-height: 0; }
+.bcol-head { display: flex; align-items: center; gap: 5px; padding: 0 2px 7px; flex-shrink: 0; }
+.bcol-name { font-size: 12px; font-weight: 700; color: #3d4450; }
+.bcol-cnt { font-size: 11px; color: #999; background: #e8ebef; border-radius: 999px; padding: 0 6px; line-height: 15px; }
+.bcol-bind { font-size: 10px; color: var(--color-primary); background: #f0f5ff; border-radius: 4px; padding: 0 4px; margin-left: auto; }
+.bcol-bind.off { color: #999; background: #f2f3f5; }
+.bcol-body { flex: 1 1 auto; min-height: 0; overflow-y: auto; display: flex; flex-direction: column; gap: 7px; padding-bottom: 8px; }
+.bcol.dragover .bcol-body { background: #eaf2ff; border-radius: 8px; outline: 1.5px dashed var(--color-primary); }
+.bcol-empty { font-size: 11px; color: #c0c4cc; text-align: center; padding: 10px 0; }
+.bcard {
+  background: #fff; border-radius: 8px; padding: 9px 10px;
+  box-shadow: 0 1px 2px rgba(0,0,0,.05); cursor: pointer; flex-shrink: 0;
+}
+.bcard.dragging { opacity: .55; transform: scale(.97) rotate(-1deg); box-shadow: 0 8px 18px rgba(15,23,42,.16); }
+.bcard.hl { outline: 2px solid var(--color-primary); outline-offset: 1px; }
+.brow1 { display: flex; align-items: flex-start; gap: 6px; }
+.btitle { flex: 1; font-size: 12.5px; font-weight: 600; line-height: 1.45; word-break: break-word; }
+.bstat { display: flex; align-items: center; padding: 2px; cursor: pointer; }
+.bmeta { display: flex; align-items: center; gap: 6px; margin-top: 6px; font-size: 10.5px; }
+.bassignee { font-size: 11px; font-weight: 600; color: #4a5160; }
+.bassignee.none { color: #b8bcc4; font-weight: 400; }
+.bmembers { font-size: 10px; color: #a7adb6; }
+.bsub {
+  display: flex; align-items: center; gap: 5px; margin-top: 5px; padding-top: 5px;
+  border-top: 1px dashed #eef0f3; font-size: 11px; color: #5a616b; cursor: pointer;
+}
+.bsub .sbox { width: 13px; height: 13px; border-radius: 50%; border: 1.3px solid #d0d0d0; flex-shrink: 0; }
+.bsub.done .sbox { background: #00b578; border-color: #00b578; }
+.bsub .stitle { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
+.bsub.done .stitle { color: #a8a8a8; text-decoration: line-through; }
+.bmore { font-size: 10px; color: #999; margin-top: 4px; }
+.bsub-add { font-size: 10.5px; color: #b8bcc4; margin-top: 6px; cursor: pointer; }
+.badd {
+  background: rgba(255,255,255,.6); border: 1px dashed #d5dae1; border-radius: 8px;
+  padding: 8px; text-align: center; font-size: 11.5px; color: #b8bcc4; cursor: pointer; flex-shrink: 0;
+}
+.drag-ghost {
+  position: fixed; z-index: 999; transform: translate(-50%, -50%); pointer-events: none;
+  background: rgba(22,119,255,.92); color: #fff; font-size: 12px; padding: 6px 10px;
+  border-radius: 8px; max-width: 180px; box-shadow: 0 8px 18px rgba(15,23,42,.25);
+}
+
+/* ---- 列设置 / 成员页 ---- */
+.cs-page { position: fixed; inset: 0; z-index: 1000; background: var(--color-bg); display: flex; flex-direction: column; }
+.cs-page .navbar-sub { display: flex; align-items: center; gap: 10px; padding: 12px 14px; background: #fff; border-bottom: 1px solid var(--color-border); flex-shrink: 0; }
+.cs-page .navbar-sub .back { font-size: 20px; color: #666; line-height: 1; cursor: pointer; }
+.cs-page .navbar-sub .title { font-size: 16px; font-weight: 700; }
+.cs-page .navbar-sub .right { margin-left: auto; display: flex; gap: 6px; }
+.cs-body { flex: 1 1 auto; min-height: 0; overflow-y: auto; padding-bottom: 20px; }
+.set-row {
+  display: flex; align-items: center; gap: 10px; background: #fff;
+  padding: 12px 14px; margin-bottom: 1px;
+}
+.set-row .sname { font-size: 13px; font-weight: 600; width: 64px; flex-shrink: 0; cursor: pointer; }
+.set-row .sctrl { flex: 1; display: flex; align-items: center; gap: 8px; justify-content: flex-end; }
+.set-hint { font-size: 11px; color: #999; padding: 8px 14px 14px; line-height: 1.7; }
+.section-h { font-size: 11px; color: #b8bcc4; letter-spacing: .5px; display: flex; align-items: center; gap: 6px; }
+.drop {
+  border: 1px solid var(--color-border); border-radius: 7px; padding: 4px 6px; font-size: 12px;
+  color: var(--color-text); background: #fff; min-width: 96px;
+}
+.drop.off { color: #999; background: #f7f8fa; }
+.cs-ord { display: flex; flex-direction: column; font-size: 9px; color: #c0c4cc; line-height: 1.1; }
+.cs-ord span { cursor: pointer; }
+.cs-del { font-size: 11px; color: #ff3141; cursor: pointer; padding: 2px 4px; }
+.cs-count { font-size: 11px; color: #999; margin-left: 8px; }
+
+/* ---- 任务详情 ---- */
+.sheet-title { font-size: 16px; font-weight: 700; margin-bottom: 4px; word-break: break-word; }
+.sheet-sub { font-size: 11.5px; color: #999; margin-bottom: 14px; }
+.field { margin-bottom: 13px; }
+.field label { display: block; font-size: 12px; color: var(--color-muted); margin-bottom: 6px; }
+.inp {
+  border: 1px solid var(--color-border); border-radius: 8px; padding: 8px 10px;
+  font-size: 14px; background: #fff; color: var(--color-text); width: 100%;
+  font-family: inherit;
+}
+textarea.inp { resize: vertical; }
+.pick-row { display: flex; align-items: center; gap: 10px; padding: 10px 4px; border-bottom: 1px solid var(--color-border); cursor: pointer; }
+.pick-row:last-child { border-bottom: none; }
+.pick-row .pn { flex: 1; font-size: 13.5px; }
+.avatar {
+  width: 26px; height: 26px; border-radius: 50%; background: #dfe6f0; color: #5a6a80;
+  font-size: 11px; font-weight: 700; display: flex; align-items: center; justify-content: center; flex-shrink: 0;
+}
+.ck { width: 18px; height: 18px; border-radius: 50%; border: 1.5px solid #d0d0d0; flex-shrink: 0; position: relative; }
+.ck.on { background: var(--color-primary); border-color: var(--color-primary); }
+.ck.on::after {
+  content: ""; position: absolute; left: 5px; top: 2px; width: 4px; height: 8px;
+  border: solid #fff; border-width: 0 1.5px 1.5px 0; transform: rotate(45deg);
+}
+.btn-primary { text-align: center; background: var(--color-primary); color: #fff; border-radius: 8px; padding: 10px 0; font-size: 15px; font-weight: 600; margin-top: 18px; cursor: pointer; }
+.btn-ghost { text-align: center; border: 1px solid var(--color-border); border-radius: 8px; padding: 9px 0; font-size: 15px; color: var(--color-muted); margin-top: 8px; background: #fff; cursor: pointer; }
+.btn-danger { text-align: center; border: 1px solid #ff3141; border-radius: 8px; padding: 9px 0; font-size: 15px; color: #ff3141; margin-top: 8px; background: #fff; cursor: pointer; }
+.del-hint { font-size: 11px; font-weight: 400; }
+.extra-row { display: flex; gap: 8px; margin-top: 8px; align-items: center; }
+.extra-k { flex: 0 0 82px; }
+.extra-v { flex: 1; }
+.extra-del { border: none; background: none; color: #c0c4cc; font-size: 18px; line-height: 1; cursor: pointer; }
+.extras { margin-top: 4px; }
+.extras-head {
+  display: flex; align-items: center; gap: 6px; font-size: 13px; font-weight: 600;
+  padding: 9px 10px; background: #f7f8fa; border-radius: 8px; cursor: pointer;
+}
+.extras-head .caret { font-size: 10px; color: #999; }
+.extras-head .cv { margin-left: auto; color: #b8bcc4; font-size: 10px; font-weight: 400; }
+.extras-body { padding: 4px 0 2px; }
+.extras-empty { font-size: 11.5px; color: #b8bcc4; padding: 8px 2px; }
+.extras-add { font-size: 12px; color: var(--color-primary); background: none; border: none; padding: 6px 2px; cursor: pointer; }
+.tag { font-size: 10px; color: var(--color-primary); background: #f0f5ff; border-radius: 4px; padding: 0 5px; }
+.tag.grey { color: #999; background: #f2f3f5; }
+
+/* ---- 空态 / 错误态 ---- */
+.empty { text-align: center; padding: 70px 20px; color: #999; }
+.empty .ico {
+  width: 64px; height: 64px; margin: 0 auto 12px; border-radius: 50%; background: #f2f3f5;
+  display: flex; align-items: center; justify-content: center; color: #c4c8ce; font-size: 30px;
+}
+.empty .ico.err { background: #fff1f0; color: #ff7875; }
+.empty p { font-size: 13px; margin-bottom: 12px; }