feat: 移动端导航重构 — 4 Tab + 工作中心 + 模块列表

- TabBar 新增「工作」标签（首页/工作/拜访/纪要）
- 新增工作中心页（/m/work），四卡片入口显示各模块记录数
- 新增三个列表页：工作计划/商机跟单/要客拜访（卡片流+删除）
- 首页精简：移除快捷 chip，入口统一到工作中心
- 路由新增: /m/work, /m/plans, /m/mini-biz, /m/key-visits

Co-Authored-By: Claude <noreply@anthropic.com>

frontend/src/router/index.ts

@@ -35,6 +35,7 @@ const router = createRouter({
       component: () => import('@/components/MobileLayout.vue'),
       children: [
         { path: '', name: 'MobileHome', component: () => import('@/views/mobile/Home.vue') },
+        { path: 'work', name: 'WorkCenter', component: () => import('@/views/mobile/WorkCenter.vue') },
         { path: 'visit/new', name: 'VisitForm', component: () => import('@/views/mobile/VisitForm.vue') },
         { path: 'visit/:id/edit', name: 'VisitEdit', component: () => import('@/views/mobile/VisitForm.vue') },
         { path: 'work-plan/new', name: 'WorkPlanForm', component: () => import('@/views/mobile/WorkPlanForm.vue') },
@@ -42,6 +43,9 @@ const router = createRouter({
         { path: 'key-visit/new', name: 'KeyVisitForm', component: () => import('@/views/mobile/KeyVisitForm.vue') },
         { path: 'note/new', name: 'DailyNoteForm', component: () => import('@/views/mobile/DailyNoteForm.vue') },
         { path: 'note/:id/edit', name: 'DailyNoteEdit', component: () => import('@/views/mobile/DailyNoteForm.vue') },
+        { path: 'plans', name: 'PlansList', component: () => import('@/views/mobile/PlansList.vue') },
+        { path: 'mini-biz', name: 'MiniBizList', component: () => import('@/views/mobile/MiniBizList.vue') },
+        { path: 'key-visits', name: 'KeyVisitsList', component: () => import('@/views/mobile/KeyVisitsList.vue') },
         { path: 'leaves', name: 'LeavesList', component: () => import('@/views/mobile/LeavesList.vue') },
         { path: 'leave/new', name: 'LeaveForm', component: () => import('@/views/mobile/LeaveForm.vue') },
         { path: 'leave/:id/edit', name: 'LeaveEdit', component: () => import('@/views/mobile/LeaveForm.vue') },