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/grades/page.tsx

@@ -0,0 +1,101 @@
+import Link from "next/link"
+import { PlusCircle, BarChart3, ClipboardList } from "lucide-react"
+import { Button } from "@/shared/components/ui/button"
+import { EmptyState } from "@/shared/components/ui/empty-state"
+import { db } from "@/shared/db"
+import { subjects } from "@/shared/db/schema"
+import { asc } from "drizzle-orm"
+import { getAuthContext } from "@/shared/lib/auth-guard"
+import { getTeacherClasses } from "@/modules/classes/data-access"
+import { getGradeRecords } from "@/modules/grades/data-access"
+import { GradeQueryFilters } from "@/modules/grades/components/grade-query-filters"
+import { GradeRecordList } from "@/modules/grades/components/grade-record-list"
+import { ExportButton } from "@/modules/grades/components/export-button"
+
+export const dynamic = "force-dynamic"
+
+type SearchParams = { [key: string]: string | string[] | undefined }
+
+const getParam = (params: SearchParams, key: string) => {
+  const v = params[key]
+  return Array.isArray(v) ? v[0] : v
+}
+
+export default async function TeacherGradesPage({ searchParams }: { searchParams: Promise<SearchParams> }) {
+  const sp = await searchParams
+  const ctx = await getAuthContext()
+
+  const classId = getParam(sp, "classId")
+  const subjectId = getParam(sp, "subjectId")
+  const type = getParam(sp, "type")
+  const semester = getParam(sp, "semester")
+
+  const [classes, allSubjects] = await Promise.all([
+    getTeacherClasses(),
+    db.query.subjects.findMany({ orderBy: [asc(subjects.order), asc(subjects.name)] }),
+  ])
+
+  const records = await getGradeRecords({
+    scope: ctx.dataScope,
+    currentUserId: ctx.userId,
+    classId: classId && classId !== "all" ? classId : undefined,
+    subjectId: subjectId && subjectId !== "all" ? subjectId : undefined,
+    type: type && type !== "all" ? (type as "exam" | "quiz" | "homework" | "other") : undefined,
+    semester: semester && semester !== "all" ? (semester as "1" | "2") : undefined,
+  })
+
+  const classOptions = classes.map((c) => ({ id: c.id, name: c.name }))
+  const subjectOptions = allSubjects.map((s) => ({ id: s.id, name: s.name }))
+
+  return (
+    <div className="h-full flex-1 flex-col space-y-8 p-8 md:flex">
+      <div className="flex items-center justify-between space-y-2">
+        <div>
+          <h2 className="text-2xl font-bold tracking-tight">Grades</h2>
+          <p className="text-muted-foreground">Manage student grade records.</p>
+        </div>
+        <div className="flex items-center gap-2">
+          <Button asChild variant="outline">
+            <Link href="/teacher/grades/stats">
+              <BarChart3 className="mr-2 h-4 w-4" />
+              Statistics
+            </Link>
+          </Button>
+          <Button asChild variant="outline">
+            <Link href="/teacher/grades/entry">
+              <ClipboardList className="mr-2 h-4 w-4" />
+              Batch Entry
+            </Link>
+          </Button>
+          <ExportButton
+            classId={classId && classId !== "all" ? classId : ""}
+            subjectId={subjectId && subjectId !== "all" ? subjectId : undefined}
+            variant="outline"
+          />
+          <Button asChild>
+            <Link href="/teacher/grades/entry">
+              <PlusCircle className="mr-2 h-4 w-4" />
+              Record Grades
+            </Link>
+          </Button>
+        </div>
+      </div>
+
+      <GradeQueryFilters classes={classOptions} subjects={subjectOptions} />
+
+      {records.length === 0 && !classId && !subjectId ? (
+        <EmptyState
+          title="No grade records"
+          description="Start by recording grades for your classes."
+          icon={ClipboardList}
+          action={{
+            label: "Record Grades",
+            href: "/teacher/grades/entry",
+          }}
+        />
+      ) : (
+        <GradeRecordList records={records} />
+      )}
+    </div>
+  )
+}