feat: 完成 P1 全部功能 + 修复 proxy 导出 + 切换 MySQL 端口至 14013

## P1 功能（20 项）
- 站内消息系统、家长仪表盘、学生考勤管理
- Excel 导入导出、用户批量导入、成绩导出
- 排课规则+自动排课+课表调整
- 成绩趋势+对比分析、密码安全策略、速率限制
- 数据变更日志、文件预览+存储策略、全文检索
- 依赖审计集成 CI、数据库定时备份、E2E 测试完善
- 通知偏好管理

## 基础设施修复
- src/proxy.ts: 将 middleware 导出重命名为 proxy（Next.js 16 要求）
- .env: MySQL 端口从 13002 切换至 14013
- scripts/create-db.ts: 新增数据库初始化脚本

## 架构文档同步
- 004_architecture_impact_map.md 和 005_architecture_data.json
  完整记录所有新增表、模块、路由、权限、依赖关系

src/app/(dashboard)/admin/users/import/page.tsx

@@ -0,0 +1,134 @@
+import { Metadata } from "next"
+import Link from "next/link"
+import { ArrowLeft, Users, FileSpreadsheet, Info } from "lucide-react"
+
+import { Button } from "@/shared/components/ui/button"
+import { Card, CardContent, CardDescription, CardHeader, CardTitle } from "@/shared/components/ui/card"
+import { UserImportDialog } from "@/modules/users/components/user-import-dialog"
+
+export const metadata: Metadata = {
+  title: "批量导入用户 - Next_Edu",
+  description: "通过 Excel 批量导入用户",
+}
+
+export default function UserImportPage() {
+  return (
+    <div className="h-full flex-1 flex-col space-y-6 p-8 md:flex">
+      <div className="flex items-center justify-between space-y-2">
+        <div>
+          <div className="flex items-center gap-2">
+            <Button asChild variant="ghost" size="sm">
+              <Link href="/admin/dashboard">
+                <ArrowLeft className="mr-1 h-4 w-4" />
+                返回
+              </Link>
+            </Button>
+            <h2 className="text-2xl font-bold tracking-tight">批量导入用户</h2>
+          </div>
+          <p className="text-muted-foreground mt-1">
+            通过 Excel 文件批量创建用户账号，支持学生自动加入班级。
+          </p>
+        </div>
+        <UserImportDialog />
+      </div>
+
+      <div className="grid gap-6 md:grid-cols-2">
+        <Card>
+          <CardHeader>
+            <div className="flex items-center gap-2">
+              <FileSpreadsheet className="h-5 w-5 text-primary" />
+              <CardTitle className="text-base">导入说明</CardTitle>
+            </div>
+            <CardDescription>使用 Excel 批量导入用户的步骤</CardDescription>
+          </CardHeader>
+          <CardContent className="space-y-3 text-sm">
+            <div className="flex gap-3">
+              <span className="flex h-6 w-6 shrink-0 items-center justify-center rounded-full bg-primary/10 text-xs font-medium text-primary">1</span>
+              <p>点击「批量导入用户」按钮，下载导入模板。</p>
+            </div>
+            <div className="flex gap-3">
+              <span className="flex h-6 w-6 shrink-0 items-center justify-center rounded-full bg-primary/10 text-xs font-medium text-primary">2</span>
+              <p>按模板格式填写用户信息（姓名、邮箱、角色、手机、班级邀请码）。</p>
+            </div>
+            <div className="flex gap-3">
+              <span className="flex h-6 w-6 shrink-0 items-center justify-center rounded-full bg-primary/10 text-xs font-medium text-primary">3</span>
+              <p>上传填写好的 Excel 文件，系统将解析并预览数据。</p>
+            </div>
+            <div className="flex gap-3">
+              <span className="flex h-6 w-6 shrink-0 items-center justify-center rounded-full bg-primary/10 text-xs font-medium text-primary">4</span>
+              <p>确认预览数据无误后，点击「确认导入」完成批量创建。</p>
+            </div>
+          </CardContent>
+        </Card>
+
+        <Card>
+          <CardHeader>
+            <div className="flex items-center gap-2">
+              <Info className="h-5 w-5 text-amber-500" />
+              <CardTitle className="text-base">注意事项</CardTitle>
+            </div>
+            <CardDescription>导入前请仔细阅读</CardDescription>
+          </CardHeader>
+          <CardContent className="space-y-2 text-sm text-muted-foreground">
+            <p>• 默认密码为 <code className="rounded bg-muted px-1 py-0.5 text-xs">123456</code>，请提示用户首次登录后修改。</p>
+            <p>• 邮箱必须唯一，重复邮箱将被跳过并记录在错误报告中。</p>
+            <p>• 角色可选：admin / teacher / student / parent / grade_head / teaching_head。</p>
+            <p>• 班级邀请码仅对 student 角色有效，填写后学生将自动加入对应班级。</p>
+            <p>• 单次最多导入 10MB 的文件，建议单次不超过 500 条记录。</p>
+            <p>• 导入完成后将显示成功数、失败数及详细错误信息。</p>
+          </CardContent>
+        </Card>
+      </div>
+
+      <Card>
+        <CardHeader>
+          <div className="flex items-center gap-2">
+            <Users className="h-5 w-5 text-primary" />
+            <CardTitle className="text-base">模板字段说明</CardTitle>
+          </div>
+          <CardDescription>Excel 模板各列含义与要求</CardDescription>
+        </CardHeader>
+        <CardContent>
+          <div className="overflow-x-auto">
+            <table className="w-full text-sm">
+              <thead>
+                <tr className="border-b">
+                  <th className="py-2 pr-4 text-left font-medium">列名</th>
+                  <th className="py-2 pr-4 text-left font-medium">是否必填</th>
+                  <th className="py-2 pr-4 text-left font-medium">说明</th>
+                </tr>
+              </thead>
+              <tbody className="divide-y">
+                <tr>
+                  <td className="py-2 pr-4 font-medium">姓名</td>
+                  <td className="py-2 pr-4">必填</td>
+                  <td className="py-2 pr-4 text-muted-foreground">用户姓名</td>
+                </tr>
+                <tr>
+                  <td className="py-2 pr-4 font-medium">邮箱</td>
+                  <td className="py-2 pr-4">必填</td>
+                  <td className="py-2 pr-4 text-muted-foreground">登录账号，需符合邮箱格式且唯一</td>
+                </tr>
+                <tr>
+                  <td className="py-2 pr-4 font-medium">角色</td>
+                  <td className="py-2 pr-4">必填</td>
+                  <td className="py-2 pr-4 text-muted-foreground">admin / teacher / student / parent / grade_head / teaching_head</td>
+                </tr>
+                <tr>
+                  <td className="py-2 pr-4 font-medium">手机</td>
+                  <td className="py-2 pr-4">选填</td>
+                  <td className="py-2 pr-4 text-muted-foreground">联系电话</td>
+                </tr>
+                <tr>
+                  <td className="py-2 pr-4 font-medium">班级邀请码</td>
+                  <td className="py-2 pr-4">选填</td>
+                  <td className="py-2 pr-4 text-muted-foreground">仅 student 角色有效，6 位邀请码</td>
+                </tr>
+              </tbody>
+            </table>
+          </div>
+        </CardContent>
+      </Card>
+    </div>
+  )
+}