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

src/hid/datachannel.rs

@@ -34,7 +34,7 @@
 //! Consumer control event (type 0x03):
 //! - Bytes 1-2: Usage code (u16 LE)
 
-use tracing::{debug, warn};
+use tracing::warn;
 
 use super::types::ConsumerEvent;
 use super::{
@@ -115,11 +115,6 @@ fn parse_keyboard_message(data: &[u8]) -> Option<HidChannelEvent> {
         right_meta: modifiers_byte & 0x80 != 0,
     };
 
-    debug!(
-        "Parsed keyboard: {:?} key=0x{:02X} modifiers=0x{:02X}",
-        event_type, key, modifiers_byte
-    );
-
     Some(HidChannelEvent::Keyboard(KeyboardEvent {
         event_type,
         key,
@@ -168,11 +163,6 @@ fn parse_mouse_message(data: &[u8]) -> Option<HidChannelEvent> {
         _ => (None, 0i8),
     };
 
-    debug!(
-        "Parsed mouse: {:?} x={} y={} button={:?} scroll={}",
-        event_type, x, y, button, scroll
-    );
-
     Some(HidChannelEvent::Mouse(MouseEvent {
         event_type,
         x,
@@ -191,8 +181,6 @@ fn parse_consumer_message(data: &[u8]) -> Option<HidChannelEvent> {
 
     let usage = u16::from_le_bytes([data[0], data[1]]);
 
-    debug!("Parsed consumer: usage=0x{:04X}", usage);
-
     Some(HidChannelEvent::Consumer(ConsumerEvent { usage }))
 }