fix: patch P0 security vulnerabilities and critical UX issues across 6 modules

Security: Add admin/layout.tsx auth guard; Add requirePermission() to 12 admin pages

Dashboard: Fix StudentStatsGrid rendering; Fix teacher greeting; Add loading/error boundaries; Fix col-span; Add metadata

Announcements: Fix audience filtering; Add user detail page; Trigger notifications on publish; Pass classes data; Add loading.tsx

Messages: Implement soft delete; Add unread badge with polling; Add notification dropdown polling; Add keyword search; Add quiet hours DND

Management: Add loading/error for 9 admin routes; Fix admin-classes-view to use Select for school/grade

Profile/Settings: Add loading/error; Fix parent role routing; Create ParentSettingsView; Integrate AiProviderSettingsCard; Add Tab URL persistence; Add logout confirm; Add avatar; Fix Progress arbitrary class

Schema: Add senderDeletedAt/receiverDeletedAt to messages; Add quietHours to notificationPreferences; Add uniqueIndex import

Docs: Update architecture docs 004/005

src/app/(dashboard)/profile/error.tsx

@@ -0,0 +1,22 @@
+"use client"
+
+import { AlertCircle } from "lucide-react"
+
+import { EmptyState } from "@/shared/components/ui/empty-state"
+
+export default function ProfileError({ reset }: { error: Error & { digest?: string }; reset: () => void }) {
+  return (
+    <div className="flex h-full flex-col items-center justify-center space-y-4 p-8">
+      <EmptyState
+        icon={AlertCircle}
+        title="页面加载失败"
+        description="抱歉，个人资料页面加载时发生了意外错误。请稍后重试。"
+        action={{
+          label: "重试",
+          onClick: () => reset(),
+        }}
+        className="border-none shadow-none h-auto"
+      />
+    </div>
+  )
+}

src/app/(dashboard)/profile/loading.tsx

@@ -0,0 +1,36 @@
+import { Card, CardContent, CardHeader } from "@/shared/components/ui/card"
+import { Skeleton } from "@/shared/components/ui/skeleton"
+
+export default function ProfileLoading() {
+  return (
+    <div className="flex h-full flex-col gap-8 p-8">
+      <div className="space-y-2">
+        <Skeleton className="h-8 w-40" />
+        <Skeleton className="h-4 w-72" />
+      </div>
+
+      <div className="flex items-center gap-4">
+        <Skeleton className="h-20 w-20 rounded-full" />
+        <div className="space-y-2">
+          <Skeleton className="h-5 w-40" />
+          <Skeleton className="h-4 w-24" />
+        </div>
+      </div>
+
+      <div className="grid gap-6 md:grid-cols-2">
+        {Array.from({ length: 2 }).map((_, i) => (
+          <Card key={i}>
+            <CardHeader>
+              <Skeleton className="h-5 w-32" />
+            </CardHeader>
+            <CardContent className="space-y-3">
+              {Array.from({ length: 4 }).map((_, j) => (
+                <Skeleton key={j} className="h-10 w-full" />
+              ))}
+            </CardContent>
+          </Card>
+        ))}
+      </div>
+    </div>
+  )
+}

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

@@ -9,6 +9,7 @@ import { StudentTodayScheduleCard } from "@/modules/dashboard/components/student
 import { StudentUpcomingAssignmentsCard } from "@/modules/dashboard/components/student-dashboard/student-upcoming-assignments-card"
 import { getStudentDashboardGrades, getStudentHomeworkAssignments } from "@/modules/homework/data-access"
 import { getUserProfile } from "@/modules/users/data-access"
+import { Avatar, AvatarFallback, AvatarImage } from "@/shared/components/ui/avatar"
 import { Badge } from "@/shared/components/ui/badge"
 import { Button } from "@/shared/components/ui/button"
 import { Card, CardContent, CardDescription, CardHeader, CardTitle } from "@/shared/components/ui/card"
@@ -129,6 +130,19 @@ export default async function ProfilePage() {
         }
       />
 
+      <div className="flex items-center gap-4">
+        <Avatar className="h-20 w-20">
+          {userProfile.image ? <AvatarImage src={userProfile.image} alt={userProfile.name ?? "User avatar"} /> : null}
+          <AvatarFallback className="text-xl font-semibold">
+            {(userProfile.name ?? userProfile.email).slice(0, 2).toUpperCase()}
+          </AvatarFallback>
+        </Avatar>
+        <div className="space-y-1">
+          <div className="text-xl font-semibold tracking-tight">{userProfile.name ?? "-"}</div>
+          <div className="text-sm text-muted-foreground">{userProfile.email}</div>
+        </div>
+      </div>
+
       <div className="grid gap-6 md:grid-cols-2">
         <Card>
           <CardHeader>