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/stores/useTaskCategoryStore.ts

@@ -0,0 +1,65 @@
+'use client';
+import { create } from 'zustand';
+import type { TaskCategory, CategoryGroup } from '@/lib/task-category';
+import { PRESET_CATEGORIES } from '@/lib/task-category';
+
+const STORAGE_KEY = 'ftb_task_categories_v1';
+
+function saveLocal(items: TaskCategory[]) {
+  try { localStorage.setItem(STORAGE_KEY, JSON.stringify(items)); } catch {}
+}
+
+function loadLocal(): TaskCategory[] | null {
+  try {
+    const raw = localStorage.getItem(STORAGE_KEY);
+    if (raw) return JSON.parse(raw);
+  } catch {}
+  return null;
+}
+
+interface TaskCategoryState {
+  categories: TaskCategory[];
+  fetchCategories: () => void;
+  addCategory: (name: string, group: CategoryGroup, color?: string) => void;
+  updateCategory: (id: string, data: Partial<TaskCategory>) => void;
+  deleteCategory: (id: string) => boolean;
+}
+
+export const useTaskCategoryStore = create<TaskCategoryState>((set, get) => ({
+  categories: PRESET_CATEGORIES,
+
+  fetchCategories: () => {
+    const cached = loadLocal();
+    if (cached) set({ categories: cached });
+  },
+
+  addCategory: (name, group, color) => {
+    const list = get().categories;
+    const item: TaskCategory = {
+      id: `cat-${Date.now()}`,
+      name,
+      group,
+      color,
+      sortOrder: list.length + 1,
+      isSystem: false,
+    };
+    const updated = [...list, item];
+    set({ categories: updated });
+    saveLocal(updated);
+  },
+
+  updateCategory: (id, data) => {
+    const updated = get().categories.map((c) => (c.id === id ? { ...c, ...data } : c));
+    set({ categories: updated });
+    saveLocal(updated);
+  },
+
+  deleteCategory: (id) => {
+    const target = get().categories.find((c) => c.id === id);
+    if (!target || target.isSystem) return false;
+    const updated = get().categories.filter((c) => c.id !== id);
+    set({ categories: updated });
+    saveLocal(updated);
+    return true;
+  },
+}));