Improve: increase tun mtu

service/src/main/java/com/github/kr328/clash/service/TunService.kt

@@ -217,7 +217,7 @@ class TunService : VpnService(), CoroutineScope by CoroutineScope(Dispatchers.De
     }
 
     companion object {
-        private const val TUN_MTU = 9000
+        private const val TUN_MTU = 65535
         private const val TUN_SUBNET_PREFIX = 30
         private const val TUN_GATEWAY = "172.19.0.1"
         private const val TUN_PORTAL = "172.19.0.2"