Logging: add informative console logs for startup, ports, connections, JOIN/deny, input, and periodic events

- Configure logging via LOG_LEVEL env (default INFO)
- Log when servers start listening (WT/QUIC/InMemory/HTTPS static)
- Log WT CONNECT accept, QUIC peer connect, datagram traffic at DEBUG
- Log GameServer creation, tick loop start, JOIN accept/deny, config_update broadcasts, and input reception

server/transport.py

@@ -2,6 +2,7 @@ from __future__ import annotations
 
 import asyncio
 from dataclasses import dataclass
+import logging
 from typing import Awaitable, Callable, Optional, Tuple
 
 
@@ -37,7 +38,7 @@ class InMemoryTransport(DatagramServerTransport):
             await self._on_datagram(data, peer)
 
     async def run(self) -> None:
-        # Nothing to do in in-memory test transport
+        logging.info("InMemory transport started (no network)")
         await asyncio.Future()