feat(web): 构建漂流瓶移动端 PWA

- 演示登录、内存令牌、单 Promise 刷新与路由守卫\n- 投瓶、捞瓶、首次回复、会话与实时聊天\n- 独立管理员登录与审核/举报工作台\n- Socket 认证续期、断线补齐与账号切换清理\n- PWA 离线壳、深海主题与移动端无障碍

apps/web/vitest.config.ts

@@ -0,0 +1,11 @@
+import vue from "@vitejs/plugin-vue";
+import { defineConfig } from "vitest/config";
+
+export default defineConfig({
+  plugins: [vue()],
+  test: {
+    environment: "jsdom",
+    setupFiles: ["./src/test/setup.ts"],
+    restoreMocks: true,
+  },
+});