Fix IPv6 TCP tunnel display formatting (#1980)

Normalize composite tunnel display values before rendering peer and
debug output so IPv6 tunnel types no longer append `6` to the port.

- Preserve prefixes like `txt-` while converting tunnel schemes to
  their IPv6 form.
- Recover malformed values such as `txt-tcp://...:110106` into
  `txt-tcp6://...:11010`.
- Reuse the normalized remote address display in CLI debug output.

easytier/src/tunnel/quic.rs

@@ -175,6 +175,9 @@ impl QuicTunnelListener {
             remote_addr: Some(
                 super::build_url_from_socket_addr(&remote_addr.to_string(), "quic").into(),
             ),
+            resolved_remote_addr: Some(
+                super::build_url_from_socket_addr(&remote_addr.to_string(), "quic").into(),
+            ),
         };
 
         Ok(Box::new(TunnelWrapper::new(
@@ -280,6 +283,10 @@ impl TunnelConnector for QuicTunnelConnector {
                 super::build_url_from_socket_addr(&local_addr.to_string(), "quic").into(),
             ),
             remote_addr: Some(self.addr.clone().into()),
+            resolved_remote_addr: Some(
+                super::build_url_from_socket_addr(&connection.remote_address().to_string(), "quic")
+                    .into(),
+            ),
         };
 
         let arc_conn = Arc::new(ConnWrapper { conn: connection });