Mode: implement MODE=net to run both WebTransport (HTTP/3) and QUIC datagram servers concurrently via MultiTransport; add port envs WT_PORT/QUIC_PORT

run.py

@@ -89,6 +89,28 @@ if __name__ == "__main__":
         elif mode == "quic":
             logging.info("Starting in QUIC datagram mode")
             asyncio.run(run_quic())
+        elif mode == "net":
+            logging.info("Starting in combined WebTransport+QUIC mode")
+            from server.webtransport_server import WebTransportServer
+            from server.quic_transport import QuicWebTransportServer
+            from server.multi_transport import MultiTransport
+            cfg = ServerConfig()
+            host_wt = os.environ.get("WT_HOST", os.environ.get("QUIC_HOST", "0.0.0.0"))
+            port_wt = int(os.environ.get("WT_PORT", os.environ.get("QUIC_PORT", "4433")))
+            host_quic = os.environ.get("QUIC_HOST", host_wt)
+            port_quic = int(os.environ.get("QUIC_PORT", "4443"))
+            cert = os.environ.get("WT_CERT") or os.environ.get("QUIC_CERT")
+            key = os.environ.get("WT_KEY") or os.environ.get("QUIC_KEY")
+            if not cert or not key:
+                raise SystemExit("WT/QUIC cert/key required: set WT_CERT/WT_KEY or QUIC_CERT/QUIC_KEY")
+            async def _run_net():
+                server: GameServer
+                wt = WebTransportServer(host_wt, port_wt, cert, key, lambda d, p: server.on_datagram(d, p))
+                qu = QuicWebTransportServer(host_quic, port_quic, cert, key, lambda d, p: server.on_datagram(d, p))
+                m = MultiTransport(wt, qu)
+                server = GameServer(transport=m, config=cfg)
+                await asyncio.gather(m.run(), server.tick_loop())
+            asyncio.run(_run_net())
         else:
             logging.info("Starting in in-memory transport mode")
             asyncio.run(run_in_memory())