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/grades/components/class-grade-report.tsx

@@ -0,0 +1,92 @@
+import { Card, CardContent, CardHeader, CardTitle } from "@/shared/components/ui/card"
+import { Badge } from "@/shared/components/ui/badge"
+import {
+  Table,
+  TableBody,
+  TableCell,
+  TableHead,
+  TableHeader,
+  TableRow,
+} from "@/shared/components/ui/table"
+import { EmptyState } from "@/shared/components/ui/empty-state"
+import { Trophy } from "lucide-react"
+
+import { GradeStatsCard } from "./grade-stats-card"
+import type { ClassGradeStats, ClassRankingItem } from "../types"
+
+interface ClassGradeReportProps {
+  stats: ClassGradeStats | null
+  ranking: ClassRankingItem[]
+}
+
+export function ClassGradeReport({ stats, ranking }: ClassGradeReportProps) {
+  return (
+    <div className="space-y-6">
+      {stats ? (
+        <div className="space-y-4">
+          <div className="flex items-center justify-between">
+            <div>
+              <h3 className="text-lg font-semibold">{stats.className}</h3>
+              <p className="text-sm text-muted-foreground">
+                {stats.studentCount} students · {stats.stats.count} grade records
+              </p>
+            </div>
+          </div>
+          <GradeStatsCard stats={stats.stats} />
+        </div>
+      ) : (
+        <EmptyState
+          title="No data"
+          description="No grade records found for this class."
+          icon={Trophy}
+          className="border-none shadow-none"
+        />
+      )}
+
+      {ranking.length > 0 ? (
+        <Card>
+          <CardHeader>
+            <CardTitle>Class Ranking</CardTitle>
+          </CardHeader>
+          <CardContent>
+            <div className="rounded-md border">
+              <Table>
+                <TableHeader>
+                  <TableRow>
+                    <TableHead className="w-16">Rank</TableHead>
+                    <TableHead>Student</TableHead>
+                    <TableHead className="text-right">Average Score</TableHead>
+                    <TableHead className="text-right">Records</TableHead>
+                  </TableRow>
+                </TableHeader>
+                <TableBody>
+                  {ranking.map((r) => (
+                    <TableRow key={r.studentId}>
+                      <TableCell>
+                        <Badge
+                          variant={
+                            r.rank === 1 ? "default" : r.rank <= 3 ? "secondary" : "outline"
+                          }
+                          className="font-mono"
+                        >
+                          #{r.rank}
+                        </Badge>
+                      </TableCell>
+                      <TableCell className="font-medium">{r.studentName}</TableCell>
+                      <TableCell className="text-right font-mono">
+                        {r.averageScore.toFixed(2)}
+                      </TableCell>
+                      <TableCell className="text-right text-muted-foreground">
+                        {r.recordCount}
+                      </TableCell>
+                    </TableRow>
+                  ))}
+                </TableBody>
+              </Table>
+            </div>
+          </CardContent>
+        </Card>
+      ) : null}
+    </div>
+  )
+}