Add new admin panel, failover, dns fallback, providers, limiters. Update XHTTP

protocol/vless/encryption/server.go

@@ -143,7 +143,7 @@ func (i *ServerInstance) Handshake(conn net.Conn, fallback *[]byte) (*CommonConn
 		if lastCTR != nil {
 			lastCTR.XORKeyStream(relays, relays[:32]) // recover this relay
 		}
-		var index = 32
+		index := 32
 		if _, ok := k.(*mlkem.DecapsulationKey768); ok {
 			index = 1088
 		}