feat(dev-task): 开发任务模块 V1 完整实现

- 核心库：dev-task.ts（类型+状态机+进度计算）、task-worklog.ts（工时）、task-category.ts（字典）、work-item.ts（聚合契约）
- Store：useDevTaskStore（CRUD+状态流转）、useTaskWorklogStore（工时记录）、useTaskCategoryStore（字典管理）
- UI组件：DevTaskTab、DevTaskCreateModal、DevTaskDetailDrawer、DevTaskRow、WorklogPanel、StatusBadge、CategoryChip
- 集成：版本详情页"开发任务"Tab、"与我相关"工作台开发任务分组、任务类型管理页
- 设计文档：spec + 实施计划

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/web/lib/dev-task.ts

@@ -0,0 +1,93 @@
+import type { Priority } from './derive';
+
+export type DevTaskStatus = 'todo' | 'in_progress' | 'testing' | 'submitted' | 'done';
+
+export interface DevTask {
+  id: string;
+  taskNo: string;
+  requirementId: string;
+  title: string;
+  description?: string;
+  categoryId: string;
+  assigneeId: string;
+  reviewerId?: string;
+  priority: Priority;
+  estimateHours: number;
+  actualHours: number;
+  startDate?: string;
+  dueDate?: string;
+  completedAt?: string;
+  status: DevTaskStatus;
+  isBlocked: boolean;
+  blockReason?: string;
+  blockedById?: string;
+  predecessorIds?: string[];
+  riskLevel?: 'low' | 'medium' | 'high';
+  createdBy: string;
+  createdAt: string;
+  updatedAt: string;
+}
+
+export const DEV_TASK_STATUS_LABEL: Record<DevTaskStatus, string> = {
+  todo: '待开发',
+  in_progress: '开发中',
+  testing: '自测',
+  submitted: '提测',
+  done: '已完成',
+};
+
+export const DEV_TASK_STATUS_COLOR: Record<DevTaskStatus, string> = {
+  todo: 'bg-zinc-100 text-zinc-600',
+  in_progress: 'bg-blue-50 text-blue-600',
+  testing: 'bg-purple-50 text-purple-600',
+  submitted: 'bg-orange-50 text-orange-600',
+  done: 'bg-emerald-50 text-emerald-600',
+};
+
+export const STATUS_PROGRESS: Record<DevTaskStatus, number> = {
+  todo: 0,
+  in_progress: 50,
+  testing: 80,
+  submitted: 90,
+  done: 100,
+};
+
+export const ALLOWED_TRANSITIONS: Record<DevTaskStatus, DevTaskStatus[]> = {
+  todo: ['in_progress'],
+  in_progress: ['testing'],
+  testing: ['submitted', 'in_progress'],
+  submitted: ['done', 'in_progress'],
+  done: [],
+};
+
+export function canTransition(from: DevTaskStatus, to: DevTaskStatus): boolean {
+  return ALLOWED_TRANSITIONS[from].includes(to);
+}
+
+export function calcTaskProgress(task: DevTask): number {
+  return STATUS_PROGRESS[task.status];
+}
+
+export function calcGroupProgress(tasks: DevTask[]): number {
+  if (tasks.length === 0) return 0;
+  const totalEstimate = tasks.reduce((sum, t) => sum + t.estimateHours, 0);
+  if (totalEstimate === 0) return 0;
+  const weighted = tasks.reduce((sum, t) => sum + t.estimateHours * STATUS_PROGRESS[t.status], 0);
+  return Math.round(weighted / totalEstimate);
+}
+
+export function formatHours(hours: number): string {
+  if (hours < 8) return `${hours}h`;
+  const days = Math.floor(hours / 8);
+  const remainder = hours % 8;
+  if (remainder === 0) return `${hours}h（${days}人天）`;
+  return `${hours}h（≈${days}人天）`;
+}
+
+export function generateTaskNo(existingTasks: DevTask[]): string {
+  const maxNum = existingTasks.reduce((max, t) => {
+    const num = parseInt(t.taskNo.replace('DEV-', ''), 10);
+    return isNaN(num) ? max : Math.max(max, num);
+  }, 0);
+  return `DEV-${String(maxNum + 1).padStart(3, '0')}`;
+}