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)/teacher/schedule-changes/page.tsx

@@ -0,0 +1,69 @@
+import { ClipboardList } from "lucide-react"
+
+import { EmptyState } from "@/shared/components/ui/empty-state"
+import { getAuthContext } from "@/shared/lib/auth-guard"
+import {
+  getAdminClassesForScheduling,
+  getScheduleChanges,
+  getTeachersForScheduling,
+} from "@/modules/scheduling/actions"
+import { ScheduleChangeForm } from "@/modules/scheduling/components/schedule-change-form"
+import { ScheduleChangeList } from "@/modules/scheduling/components/schedule-change-list"
+
+export const dynamic = "force-dynamic"
+
+export default async function TeacherScheduleChangesPage() {
+  const ctx = await getAuthContext()
+
+  // Teachers see only their own requests; admins landing here see all.
+  const requesterId = ctx.roles.includes("admin") ? undefined : ctx.userId
+
+  const [classes, teachers, items] = await Promise.all([
+    getAdminClassesForScheduling(),
+    getTeachersForScheduling(),
+    getScheduleChanges({ requesterId }),
+  ])
+
+  const classOptions = classes.map((c) => ({ id: c.id, name: c.name, grade: c.grade }))
+  const teacherOptions = teachers.map((t) => ({
+    id: t.id,
+    name: t.name ?? "Unknown",
+    email: t.email ?? "",
+  }))
+
+  return (
+    <div className="flex h-full flex-col space-y-8 p-8">
+      <div className="space-y-1">
+        <h2 className="text-2xl font-bold tracking-tight">Schedule Change Requests</h2>
+        <p className="text-muted-foreground">
+          Submit a schedule change or substitute teacher request, and track its status.
+        </p>
+      </div>
+
+      {classOptions.length === 0 ? (
+        <EmptyState
+          icon={ClipboardList}
+          title="No classes available"
+          description="There are no classes available to request schedule changes for."
+        />
+      ) : (
+        <div className="space-y-8">
+          <ScheduleChangeForm classes={classOptions} teachers={teacherOptions} />
+
+          <div className="space-y-2">
+            <h3 className="text-lg font-semibold">My Requests</h3>
+            {items.length === 0 ? (
+              <EmptyState
+                icon={ClipboardList}
+                title="No requests yet"
+                description="Your submitted schedule change requests will appear here."
+              />
+            ) : (
+              <ScheduleChangeList items={items} canApprove={false} />
+            )}
+          </div>
+        </div>
+      )}
+    </div>
+  )
+}