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/announcements/components/announcement-list.tsx

@@ -0,0 +1,108 @@
+"use client"
+
+import { useMemo, useState } from "react"
+import { useRouter } from "next/navigation"
+import { Plus } from "lucide-react"
+
+import { Button } from "@/shared/components/ui/button"
+import { EmptyState } from "@/shared/components/ui/empty-state"
+import {
+  Select,
+  SelectContent,
+  SelectItem,
+  SelectTrigger,
+  SelectValue,
+} from "@/shared/components/ui/select"
+import { Megaphone } from "lucide-react"
+
+import { AnnouncementCard } from "./announcement-card"
+import type { Announcement, AnnouncementStatus } from "../types"
+
+type Filter = "all" | AnnouncementStatus
+
+const FILTER_OPTIONS: { value: Filter; label: string }[] = [
+  { value: "all", label: "All" },
+  { value: "published", label: "Published" },
+  { value: "draft", label: "Draft" },
+  { value: "archived", label: "Archived" },
+]
+
+export function AnnouncementList({
+  announcements,
+  canManage,
+  createHref,
+  detailHrefBuilder,
+  initialStatus,
+}: {
+  announcements: Announcement[]
+  canManage?: boolean
+  createHref?: string
+  detailHrefBuilder?: (id: string) => string
+  initialStatus?: Filter
+}) {
+  const router = useRouter()
+  const [filter, setFilter] = useState<Filter>(initialStatus ?? "all")
+
+  const filtered = useMemo(() => {
+    if (filter === "all") return announcements
+    return announcements.filter((a) => a.status === filter)
+  }, [announcements, filter])
+
+  const handleFilterChange = (value: string) => {
+    setFilter(value as Filter)
+    const params = new URLSearchParams()
+    if (value !== "all") params.set("status", value)
+    const qs = params.toString()
+    router.replace(qs ? `?${qs}` : "?")
+  }
+
+  return (
+    <div className="space-y-6">
+      <div className="flex flex-wrap items-center justify-between gap-3">
+        <Select value={filter} onValueChange={handleFilterChange}>
+          <SelectTrigger className="w-[180px]">
+            <SelectValue placeholder="Filter by status" />
+          </SelectTrigger>
+          <SelectContent>
+            {FILTER_OPTIONS.map((opt) => (
+              <SelectItem key={opt.value} value={opt.value}>
+                {opt.label}
+              </SelectItem>
+            ))}
+          </SelectContent>
+        </Select>
+        {canManage && createHref ? (
+          <Button asChild>
+            <a href={createHref}>
+              <Plus className="mr-2 h-4 w-4" />
+              New Announcement
+            </a>
+          </Button>
+        ) : null}
+      </div>
+
+      {filtered.length === 0 ? (
+        <EmptyState
+          title="No announcements"
+          description={
+            announcements.length === 0
+              ? "There are no announcements yet."
+              : "No announcements match the current filter."
+          }
+          icon={Megaphone}
+          className="h-auto border-none shadow-none"
+        />
+      ) : (
+        <div className="grid grid-cols-1 gap-4 md:grid-cols-2 lg:grid-cols-3">
+          {filtered.map((a) => (
+            <AnnouncementCard
+              key={a.id}
+              announcement={a}
+              href={detailHrefBuilder ? detailHrefBuilder(a.id) : undefined}
+            />
+          ))}
+        </div>
+      )}
+    </div>
+  )
+}