fix(dashboard): v3 审计修复 — 数据完整性、i18n、类型安全、死代码清理

P0 修复（严重）:
- admin ContentRow 标签与值错配（stats.users→textbooks 等 6 处）
- admin/error.tsx 硬编码中文替换为 useTranslations
- UserGrowthChart 空数据时渲染 EmptyState（userGrowth/homeworkTrend 永远为空数组）

P1 修复（高）:
- 新增 admin/dashboard 和 student/dashboard 的 loading.tsx + error.tsx
- 抽取 DashboardLoadingSkeleton 和 DashboardErrorFallback 共享组件，消除 5 套重复文件
- formatDate/formatLongDate 传入用户 locale（admin/teacher/student 共 6 个组件）
- 移除死代码：getCachedAdminDashboard、AvatarImage src={undefined}、TeacherStats isLoading prop
- filterTodaySchedule 改为泛型函数，消除 as 类型断言
- 辅助函数 getStatus/getDueUrgency 新增显式返回类型
- UserGrowthChart 新增 labelKey prop 区分用户增长/作业提交趋势标签

P2 修复（中）:
- 4 个组件从客户端转为服务端组件（DashboardGreetingHeader、TeacherQuickActions、TeacherDashboardHeader、StudentDashboardHeader）
- Student dashboard 空状态新增 CTA（viewSchedule、viewAll）
- TeacherHomeworkCard 图标按钮新增 aria-label
- TeacherTodoCard 排序逻辑重写为可读的 if/return 模式

同步更新:
- docs/architecture/005_architecture_data.json 新增 DashboardLoadingSkeleton、DashboardErrorFallback 条目
- 新增 docs/architecture/audit/dashboard-audit-report-v3.md 审计报告
- dashboard.json 新增 6 个 i18n 键（textbooks/chapters/questions/exams/totalAssignments/totalSubmissions）

src/app/(dashboard)/teacher/homework/submissions/page.tsx

@@ -10,33 +10,45 @@ import {
   TableHeader,
   TableRow,
 } from "@/shared/components/ui/table"
+import { ListPagination, computePagination, paginate } from "@/shared/components/ui/list-pagination"
 import { formatDate } from "@/shared/lib/utils"
+import { type SearchParams } from "@/shared/lib/search-params"
 import { getHomeworkAssignmentReviewList } from "@/modules/homework/data-access"
 import { Inbox } from "lucide-react"
 import { getTeacherIdForMutations } from "@/modules/classes/data-access"
 
 export const dynamic = "force-dynamic"
 
-export default async function SubmissionsPage(): Promise<JSX.Element> {
+const PAGE_SIZE = 10
+
+export default async function SubmissionsPage({ searchParams }: { searchParams: Promise<SearchParams> }): Promise<JSX.Element> {
+  const sp = await searchParams
   const creatorId = await getTeacherIdForMutations()
   const assignments = await getHomeworkAssignmentReviewList({ creatorId })
   const hasAssignments = assignments.length > 0
 
+  // 分页计算
+  const { page } = computePagination(sp, PAGE_SIZE)
+  const total = assignments.length
+  const totalPages = Math.max(1, Math.ceil(total / PAGE_SIZE))
+  const currentPage = Math.min(page, totalPages)
+  const pagedAssignments = paginate(assignments, currentPage, PAGE_SIZE)
+
   return (
     <div className="h-full flex-1 flex-col space-y-8 p-8 md:flex">
       <div className="flex items-center justify-between space-y-2">
         <div>
-          <h1 className="text-2xl font-bold tracking-tight">Submissions</h1>
+          <h1 className="text-2xl font-bold tracking-tight">作业提交</h1>
           <p className="text-muted-foreground">
-            Review homework by assignment.
+            按作业查看提交与批改进度。
           </p>
         </div>
       </div>
 
       {!hasAssignments ? (
         <EmptyState
-          title="No assignments"
-          description="There are no homework assignments to review yet."
+          title="暂无作业"
+          description="还没有可批改的作业。"
           icon={Inbox}
         />
       ) : (
@@ -44,39 +56,59 @@ export default async function SubmissionsPage(): Promise<JSX.Element> {
           <Table>
             <TableHeader>
               <TableRow>
-                <TableHead>Assignment</TableHead>
-                <TableHead>Status</TableHead>
-                <TableHead>Due</TableHead>
-                <TableHead className="text-right">Targets</TableHead>
-                <TableHead className="text-right">Submitted</TableHead>
-                <TableHead className="text-right">Graded</TableHead>
+                <TableHead>作业</TableHead>
+                <TableHead>状态</TableHead>
+                <TableHead>截止时间</TableHead>
+                <TableHead className="text-right">应交</TableHead>
+                <TableHead className="text-right">已交</TableHead>
+                <TableHead className="text-right">已批</TableHead>
+                <TableHead className="text-right">提交率</TableHead>
               </TableRow>
             </TableHeader>
             <TableBody>
-              {assignments.map((a) => (
-                <TableRow key={a.id}>
-                  <TableCell className="font-medium">
-                    <Link
-                      href={`/teacher/homework/assignments/${a.id}/submissions`}
-                      className="hover:underline line-clamp-2 max-w-[240px]"
-                    >
-                      {a.title}
-                    </Link>
-                    <div className="text-xs text-muted-foreground truncate max-w-[200px]">{a.sourceExamTitle}</div>
-                  </TableCell>
-                  <TableCell>
-                    <Badge variant="outline" className="capitalize">
-                      {a.status}
-                    </Badge>
-                  </TableCell>
-                  <TableCell className="text-muted-foreground tabular-nums">{a.dueAt ? formatDate(a.dueAt) : "-"}</TableCell>
-                  <TableCell className="text-right tabular-nums">{a.targetCount}</TableCell>
-                  <TableCell className="text-right tabular-nums">{a.submittedCount}</TableCell>
-                  <TableCell className="text-right tabular-nums">{a.gradedCount}</TableCell>
-                </TableRow>
-              ))}
+              {pagedAssignments.map((a) => {
+                const submissionRate = a.targetCount > 0 ? (a.submittedCount / a.targetCount) * 100 : 0
+                return (
+                  <TableRow key={a.id}>
+                    <TableCell className="font-medium">
+                      <Link
+                        href={`/teacher/homework/assignments/${a.id}/submissions`}
+                        className="hover:underline line-clamp-2 max-w-[240px]"
+                      >
+                        {a.title}
+                      </Link>
+                      {a.sourceExamTitle ? (
+                        <div className="text-xs text-muted-foreground truncate max-w-[200px]">{a.sourceExamTitle}</div>
+                      ) : (
+                        <div className="text-xs text-muted-foreground italic">快速作业</div>
+                      )}
+                    </TableCell>
+                    <TableCell>
+                      <Badge variant="outline" className="capitalize">
+                        {a.status}
+                      </Badge>
+                    </TableCell>
+                    <TableCell className="text-muted-foreground tabular-nums">{a.dueAt ? formatDate(a.dueAt) : "-"}</TableCell>
+                    <TableCell className="text-right tabular-nums">{a.targetCount}</TableCell>
+                    <TableCell className="text-right tabular-nums">{a.submittedCount}</TableCell>
+                    <TableCell className="text-right tabular-nums">{a.gradedCount}</TableCell>
+                    <TableCell className="text-right tabular-nums">
+                      {a.targetCount > 0 ? `${submissionRate.toFixed(0)}%` : "-"}
+                    </TableCell>
+                  </TableRow>
+                )
+              })}
             </TableBody>
           </Table>
+          <ListPagination
+            page={currentPage}
+            pageSize={PAGE_SIZE}
+            total={total}
+            totalPages={totalPages}
+            basePath="/teacher/homework/submissions"
+            searchParams={sp}
+            itemLabel="个作业"
+          />
         </div>
       )}
     </div>