feat(dashboard): 实现所有长期问题修复（P2-1/P2-5/P2-7/P2-9）

P2-9: TeacherSchedule 重复渲染优化
- 将移动端（lg:hidden）和桌面端（hidden lg:block）的双实例渲染改为单实例
- 使用 CSS flex order + grid col-start/row-start 实现响应式布局重排序
- 消除服务端 HTML 负载翻倍问题

P2-5: StudentTodayScheduleCard 时间过时修复
- 新增 useCurrentTime hook（src/shared/hooks/use-current-time.ts）
- 每分钟自动更新当前时间，useMemo 依赖 [items, now] 确保徽章不过时
- SSR 安全：初始渲染用 new Date()，挂载后 setInterval 更新

P2-1: 流式/Suspense 架构改造
- 新增 getAdminDashboardStreams（streams.ts）：返回各独立数据源的未解析 Promise
- Admin dashboard：7 个分区组件用 React use() 独立消费 Promise，各 Suspense 边界独立流式渲染
- Teacher/Student/Parent dashboard：传入未解析 Promise，视图用 use() 消费，启用 Suspense 流式
- 页面外壳（标题 + 快捷操作）立即渲染，数据到达后各分区按各自速度填充

P2-7: 组件测试 + 路由测试修复
- 修复 dashboard-routing.test.ts：移除误导性的 permissions 字段（实际用 resolvePermissions(roles)）
- 新增 fallback 路由测试（未知角色 → teacher dashboard）
- 新增 DashboardSection 组件测试（6 个测试：骨架屏变体 + 错误边界 + 正常渲染）
- 新增 useCurrentTime hook 测试（3 个测试：初始值 + 间隔更新 + 清理）

同步更新:
- docs/architecture/005_architecture_data.json 新增 7 个流式组件 + useCurrentTime hook + getAdminDashboardStreams 条目

src/app/(dashboard)/parent/dashboard/page.tsx

@@ -1,11 +1,19 @@
 import type { Metadata } from "next"
 import type { JSX } from "react"
 import { getTranslations } from "next-intl/server"
+import { use } from "react"
+import { Users } from "lucide-react"
 
 import { getParentDashboardAction } from "@/modules/dashboard/actions"
 import { ParentDashboard } from "@/modules/parent/components/parent-dashboard"
 import { ParentNoChildrenPage } from "@/modules/parent/components/parent-children-data-page"
-import { Users } from "lucide-react"
+import type { ActionState } from "@/shared/types/action-state"
+import type { ParentDashboardData } from "@/modules/parent/types"
+
+type ParentDashboardResult = ActionState<{
+  data: ParentDashboardData | null
+  hasChildren: boolean
+}>
 
 export const dynamic = "force-dynamic"
 
@@ -18,8 +26,27 @@ export async function generateMetadata(): Promise<Metadata> {
 }
 
 export default async function ParentDashboardPage(): Promise<JSX.Element> {
+  // 传入未解析的 Promise，视图内用 React `use()` 消费，启用 Suspense 流式渲染
+  const dataPromise = getParentDashboardAction()
+  return <ParentDashboardResolver dataPromise={dataPromise} />
+}
+
+function ParentDashboardResolver({ dataPromise }: { dataPromise: Promise<ParentDashboardResult> }) {
+  const result = use(dataPromise)
+  if (!result.success || !result.data) {
+    throw new Error(result.message ?? "Failed to load parent dashboard")
+  }
+  return <ParentDashboardBody data={result.data.data} hasChildren={result.data.hasChildren} />
+}
+
+async function ParentDashboardBody({
+  data,
+  hasChildren,
+}: {
+  data: ParentDashboardData | null
+  hasChildren: boolean
+}) {
   const t = await getTranslations("dashboard")
-  const { data, hasChildren } = await getParentDashboardAction()
 
   if (!data || !hasChildren) {
     return (