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/useTaskWorklogStore.ts

@@ -0,0 +1,57 @@
+'use client';
+import { create } from 'zustand';
+import type { TaskWorklog } from '@/lib/task-worklog';
+
+const STORAGE_KEY = 'ftb_task_worklogs_v1';
+
+function saveLocal(items: TaskWorklog[]) {
+  try { localStorage.setItem(STORAGE_KEY, JSON.stringify(items)); } catch {}
+}
+
+function loadLocal(): TaskWorklog[] | null {
+  try {
+    const raw = localStorage.getItem(STORAGE_KEY);
+    if (raw) return JSON.parse(raw);
+  } catch {}
+  return null;
+}
+
+interface TaskWorklogState {
+  worklogs: TaskWorklog[];
+  fetchWorklogs: () => void;
+  addWorklog: (data: Omit<TaskWorklog, 'id' | 'createdAt'>) => void;
+  deleteWorklog: (id: string) => void;
+  getActualHours: (taskId: string) => number;
+}
+
+export const useTaskWorklogStore = create<TaskWorklogState>((set, get) => ({
+  worklogs: [],
+
+  fetchWorklogs: () => {
+    const cached = loadLocal();
+    if (cached) set({ worklogs: cached });
+  },
+
+  addWorklog: (data) => {
+    const item: TaskWorklog = {
+      ...data,
+      id: `wl-${Date.now()}`,
+      createdAt: new Date().toISOString(),
+    };
+    const updated = [...get().worklogs, item];
+    set({ worklogs: updated });
+    saveLocal(updated);
+  },
+
+  deleteWorklog: (id) => {
+    const updated = get().worklogs.filter((w) => w.id !== id);
+    set({ worklogs: updated });
+    saveLocal(updated);
+  },
+
+  getActualHours: (taskId) => {
+    return get().worklogs
+      .filter((w) => w.taskId === taskId)
+      .reduce((sum, w) => sum + w.hours, 0);
+  },
+}));