fix(webrtc): 更新ICE服务器配置，新增备用TURN服务器并修复iOS模拟器连接问题

- 新增47.242.112.133的STUN/TURN服务器作为备用中继
- Flutter端添加turns: TLS中继，修复iOS模拟器无法获取relay候选的问题
- Web端同步添加新的ICE服务器配置
- 添加.gitignore忽略IDE配置文件

WebRTCControlled/app/src/main/java/com/ttstd/controlled/webrtc/WebRtcClient.java

@@ -284,8 +284,10 @@ public class WebRtcClient {
         // 建议：如果你有 TURN 服务器，请务必在此处添加，例如：
         // iceServers.add(PeerConnection.IceServer.builder("turn:your_turn_server").setUsername("user").setPassword("pass").createIceServer());
         iceServers.add(PeerConnection.IceServer.builder("turn:175.178.213.60:3478").setUsername("fanhuitong").setPassword("Fan19961207..").createIceServer());
-        // iceServers.add(PeerConnection.IceServer.builder("turn:192.168.5.224:3478").setUsername("tt").setPassword("fht").createIceServer());
         iceServers.add(PeerConnection.IceServer.builder("stun:175.178.213.60:3478").createIceServer());
+        iceServers.add(PeerConnection.IceServer.builder("turn:47.242.112.133:3478").setUsername("ttstd").setPassword("fanhuitong").createIceServer());
+        iceServers.add(PeerConnection.IceServer.builder("stun:47.242.112.133:3478").createIceServer());
+        // iceServers.add(PeerConnection.IceServer.builder("turn:192.168.5.224:3478").setUsername("tt").setPassword("fht").createIceServer());
         // iceServers.add(PeerConnection.IceServer.builder("stun:192.168.5.224:3478").createIceServer());
         iceServers.add(PeerConnection.IceServer.builder("stun:stun.l.google.com:19302").createIceServer());
         iceServers.add(PeerConnection.IceServer.builder("stun:stun1.l.google.com:19302").createIceServer());