优化：公屏预加载叫号音频素材

需求：页面打开后缓存音频片段，叫号时避免临时下载造成延迟。

实现：页面挂载时预加载全部数字与提示语 WAV，后端继续返回叫号数据/文本，前端按文本映射片段播放。

验证：前端 66 项测试通过，生产构建通过。

web/src/hooks/useAudioAnnouncements.test.ts

@@ -1,5 +1,10 @@
-import { describe, expect, it } from "vitest";
-import { announcementAudioQueue } from "./useAudioAnnouncements";
+import { renderHook } from "@testing-library/react";
+import { afterEach, describe, expect, it } from "vitest";
+import { announcementAudioQueue, audioPreloadSources, useAudioAnnouncements } from "./useAudioAnnouncements";
+
+afterEach(() => {
+  document.head.querySelectorAll("link[data-queue-voice-preload]").forEach((link) => link.remove());
+});
 
 describe("announcementAudioQueue", () => {
   it("忽略项目名并把单号码播报素材重复三遍", () => {
@@ -34,4 +39,15 @@ describe("announcementAudioQueue", () => {
       "/audio/queue-voice/entrance.wav",
     ]);
   });
+
+  it("打开页面时预加载全部声音素材", () => {
+    const { unmount } = renderHook(() => useAudioAnnouncements());
+    const links = Array.from(document.head.querySelectorAll<HTMLLinkElement>("link[data-queue-voice-preload]"));
+
+    expect(links.map((link) => link.getAttribute("href"))).toEqual(audioPreloadSources);
+    expect(links.every((link) => link.rel === "preload" && link.getAttribute("as") === "audio")).toBe(true);
+
+    unmount();
+    expect(document.head.querySelector("link[data-queue-voice-preload]")).toBeNull();
+  });
 });