feat(webrtc): 添加公共ICE服务器支持和优化HID延迟

- 重构ICE配置：将TURN配置改为统一的ICE配置，支持STUN和多TURN URL
- 添加公共ICE服务器：类似RustDesk，用户留空时使用编译时配置的公共服务器
- 优化DataChannel HID消息：使用tokio::spawn立即处理，避免依赖webrtc-rs轮询
- 添加WebRTCReady事件：客户端等待此事件后再建立连接
- 初始化时启动音频流，确保WebRTC可订阅
- 移除多余的trace/debug日志减少开销
- 更新前端配置界面支持公共ICE服务器显示

web/src/views/SettingsView.vue

@@ -1,5 +1,5 @@
 <script setup lang="ts">
-import { ref, onMounted } from 'vue'
+import { ref, computed, onMounted } from 'vue'
 import { useI18n } from 'vue-i18n'
 import { useSystemStore } from '@/stores/system'
 import {
@@ -252,6 +252,12 @@ const config = ref({
 // 跟踪服务器是否已配置 TURN 密码
 const hasTurnPassword = ref(false)
 
+// 跟踪公共 ICE 服务器状态
+const hasPublicIceServers = ref(false)
+const usingPublicIceServers = computed(() => {
+  return !config.value.stun_server && !config.value.turn_server && hasPublicIceServers.value
+})
+
 // OTG Descriptor settings
 const otgVendorIdHex = ref('1d6b')
 const otgProductIdHex = ref('0104')
@@ -305,7 +311,7 @@ const selectedBackendFormats = computed(() => {
 })
 
 // Video selection computed properties
-import { computed, watch } from 'vue'
+import { watch } from 'vue'
 
 const selectedDevice = computed(() => {
   return devices.value.video.find(d => d.path === config.value.video_device)
@@ -555,6 +561,9 @@ async function loadConfig() {
     // 设置是否已配置 TURN 密码
     hasTurnPassword.value = stream.has_turn_password || false
 
+    // 设置公共 ICE 服务器状态
+    hasPublicIceServers.value = stream.has_public_ice_servers || false
+
     // 加载 OTG 描述符配置
     if (hid.otg_descriptor) {
       otgVendorIdHex.value = hid.otg_descriptor.vendor_id?.toString(16).padStart(4, '0') || '1d6b'
@@ -1068,7 +1077,7 @@ onMounted(async () => {
 
 <template>
   <AppLayout>
-    <div class="flex h-[calc(100vh-6rem)]">
+    <div class="flex h-full overflow-hidden">
       <!-- Mobile Header -->
       <div class="lg:hidden fixed top-16 left-0 right-0 z-20 flex items-center justify-between px-4 py-3 border-b bg-background">
         <h1 class="text-lg font-semibold">{{ t('settings.title') }}</h1>
@@ -1259,6 +1268,9 @@ onMounted(async () => {
                     :placeholder="t('settings.stunServerPlaceholder')"
                   />
                   <p class="text-xs text-muted-foreground">{{ t('settings.stunServerHint') }}</p>
+                  <p v-if="usingPublicIceServers && hasPublicIceServers" class="text-xs text-blue-500">
+                    {{ t('settings.usingPublicIceServers') }}
+                  </p>
                 </div>
                 <Separator />
                 <div class="space-y-2">