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/task-category.ts

@@ -0,0 +1,36 @@
+export type CategoryGroup = 'development' | 'testing' | 'implementation' | 'other';
+
+export interface TaskCategory {
+  id: string;
+  name: string;
+  group: CategoryGroup;
+  color?: string;
+  sortOrder: number;
+  isSystem: boolean;
+}
+
+export const CATEGORY_GROUP_LABEL: Record<CategoryGroup, string> = {
+  development: '开发',
+  testing: '测试',
+  implementation: '实施',
+  other: '其他',
+};
+
+export const PRESET_CATEGORIES: TaskCategory[] = [
+  { id: 'cat-1', name: '前端开发', group: 'development', color: '#3b82f6', sortOrder: 1, isSystem: true },
+  { id: 'cat-2', name: '后端开发', group: 'development', color: '#6366f1', sortOrder: 2, isSystem: true },
+  { id: 'cat-3', name: '数据库设计', group: 'development', color: '#8b5cf6', sortOrder: 3, isSystem: true },
+  { id: 'cat-4', name: '接口联调', group: 'development', color: '#0ea5e9', sortOrder: 4, isSystem: true },
+  { id: 'cat-5', name: '测试验证', group: 'testing', color: '#a855f7', sortOrder: 5, isSystem: true },
+  { id: 'cat-6', name: '缺陷修复', group: 'testing', color: '#ef4444', sortOrder: 6, isSystem: true },
+  { id: 'cat-7', name: '数据处理', group: 'implementation', color: '#f59e0b', sortOrder: 7, isSystem: true },
+  { id: 'cat-8', name: '实施支持', group: 'implementation', color: '#10b981', sortOrder: 8, isSystem: true },
+];
+
+export function getCategoryById(categories: TaskCategory[], id: string): TaskCategory | undefined {
+  return categories.find((c) => c.id === id);
+}
+
+export function getCategoriesByGroup(categories: TaskCategory[], group: CategoryGroup): TaskCategory[] {
+  return categories.filter((c) => c.group === group).sort((a, b) => a.sortOrder - b.sortOrder);
+}