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/modules/attendance/data-access-stats.ts

@@ -0,0 +1,145 @@
+import "server-only"
+
+import { and, asc, desc, eq, gte, lte } from "drizzle-orm"
+
+import { db } from "@/shared/db"
+import { attendanceRecords, classes, users } from "@/shared/db/schema"
+
+import type {
+  AttendanceListItem,
+  AttendanceStats,
+  ClassAttendanceSummary,
+  StudentAttendanceSummary,
+} from "./types"
+
+const EMPTY_STATS: AttendanceStats = {
+  total: 0,
+  present: 0,
+  absent: 0,
+  late: 0,
+  earlyLeave: 0,
+  excused: 0,
+  presentRate: 0,
+  lateRate: 0,
+}
+
+const computeStats = (rows: { status: string }[]): AttendanceStats => {
+  if (rows.length === 0) return EMPTY_STATS
+  const stats: AttendanceStats = { ...EMPTY_STATS, total: rows.length }
+  for (const r of rows) {
+    if (r.status === "present") stats.present += 1
+    else if (r.status === "absent") stats.absent += 1
+    else if (r.status === "late") stats.late += 1
+    else if (r.status === "early_leave") stats.earlyLeave += 1
+    else if (r.status === "excused") stats.excused += 1
+  }
+  stats.presentRate = Math.round((stats.present / stats.total) * 10000) / 100
+  stats.lateRate = Math.round((stats.late / stats.total) * 10000) / 100
+  return stats
+}
+
+const serializeDate = (d: Date | string | null): string =>
+  d ? new Date(d).toISOString().slice(0, 10) : ""
+
+export async function getStudentAttendanceSummary(
+  studentId: string,
+  startDate?: string,
+  endDate?: string
+): Promise<StudentAttendanceSummary | null> {
+  const [student] = await db
+    .select({ name: users.name })
+    .from(users)
+    .where(eq(users.id, studentId))
+    .limit(1)
+  if (!student) return null
+
+  const conditions = [eq(attendanceRecords.studentId, studentId)]
+  if (startDate) conditions.push(gte(attendanceRecords.date, new Date(startDate)))
+  if (endDate) conditions.push(lte(attendanceRecords.date, new Date(endDate)))
+
+  const rows = await db
+    .select({
+      record: attendanceRecords,
+      className: classes.name,
+    })
+    .from(attendanceRecords)
+    .leftJoin(classes, eq(classes.id, attendanceRecords.classId))
+    .where(and(...conditions))
+    .orderBy(desc(attendanceRecords.date))
+
+  const stats = computeStats(rows.map((r) => ({ status: r.record.status })))
+
+  const recentRecords: AttendanceListItem[] = rows.slice(0, 20).map((r) => ({
+    id: r.record.id,
+    studentId: r.record.studentId,
+    studentName: student.name ?? "Unknown",
+    classId: r.record.classId,
+    className: r.className ?? "Unknown",
+    scheduleId: r.record.scheduleId ?? null,
+    date: serializeDate(r.record.date),
+    status: r.record.status,
+    remark: r.record.remark ?? null,
+    recordedBy: r.record.recordedBy,
+    recorderName: "Unknown",
+    createdAt: r.record.createdAt.toISOString(),
+  }))
+
+  return {
+    studentId,
+    studentName: student.name ?? "Unknown",
+    stats,
+    recentRecords,
+  }
+}
+
+export async function getClassAttendanceStats(
+  classId: string,
+  startDate?: string,
+  endDate?: string
+): Promise<ClassAttendanceSummary | null> {
+  const [classRow] = await db
+    .select({ id: classes.id, name: classes.name })
+    .from(classes)
+    .where(eq(classes.id, classId))
+    .limit(1)
+  if (!classRow) return null
+
+  const conditions = [eq(attendanceRecords.classId, classId)]
+  if (startDate) conditions.push(gte(attendanceRecords.date, new Date(startDate)))
+  if (endDate) conditions.push(lte(attendanceRecords.date, new Date(endDate)))
+
+  const rows = await db
+    .select({
+      record: attendanceRecords,
+      studentName: users.name,
+    })
+    .from(attendanceRecords)
+    .leftJoin(users, eq(users.id, attendanceRecords.studentId))
+    .where(and(...conditions))
+    .orderBy(asc(users.name))
+
+  const stats = computeStats(rows.map((r) => ({ status: r.record.status })))
+
+  const studentRecords: AttendanceListItem[] = rows.map((r) => ({
+    id: r.record.id,
+    studentId: r.record.studentId,
+    studentName: r.studentName ?? "Unknown",
+    classId: r.record.classId,
+    className: classRow.name,
+    scheduleId: r.record.scheduleId ?? null,
+    date: serializeDate(r.record.date),
+    status: r.record.status,
+    remark: r.record.remark ?? null,
+    recordedBy: r.record.recordedBy,
+    recorderName: "Unknown",
+    createdAt: r.record.createdAt.toISOString(),
+  }))
+
+  return {
+    classId,
+    className: classRow.name,
+    date: startDate ?? endDate ?? new Date().toISOString().slice(0, 10),
+    stats,
+    studentRecords,
+  }
+}