Replace IW4MAdmin with direct RCON for player counts

IW4M kept hitting a network wall (container -> host LAN IP -> IW4M
loopback bind) that we couldn't cleanly punch through, and the two-minute
!rt token added enough operational friction that the pause-all-deployments
gate never got a fair test. RCON gives us the same fact — how many
players are on a server right now — direct from each game server over
UDP, with no session, no token, no proxy.

- Add integrations/rcon.ts: dgram UDP client. rconGetPlayerCount() and
  rconGetStatus() parse both `status` (print + scoreboard) and
  `statusResponse` (info line + rows) dialects. Timeout via
  RCON_TIMEOUT_MS.
- Add komodoResolveGamePort() + extractUdpPort(). Reads Komodo's read
  API for a server, walks both docker-compose-style port objects and
  docker-run-style "host:container/udp" strings, caches into
  servers.game_port on first success.
- Replace pipelineReady() guard in sweep with a simple
  integrations-configured check. Same held/failed/manual outcomes,
  but keyed on RCON+Komodo instead of IW4M+auth-state.
- Worker's status refresh fans out per-server over RCON at concurrency=4
  so a 15-server fleet doesn't spike UDP.
- Schema: drop iw4m_match/iw4m_value, add game_port + rcon_host.
- Delete every auth artifact: TokenModal, auth store, auth-state module,
  /api/auth/token, /api/events/auth, iw4m.test.ts. Layout no longer
  mounts the modal, pipeline store no longer tracks a frozen state.
- README + .env.example + docker-compose.yml + komodo/stack.toml swap
  IW4M_* env for RCON_PASSWORD / RCON_HOST / RCON_TIMEOUT_MS. Same
  host.docker.internal:host-gateway extra_hosts entry, repurposed
  for RCON reach.
- Tests: add rcon.test.ts and komodo.test.ts, update sweep.test.ts to
  drop the auth-freeze case. 23/23 passing.

docker-compose.yml

@@ -7,6 +7,11 @@ services:
     restart: unless-stopped
     ports:
       - "3000:3000"
+    # Lets RCON_HOST=host.docker.internal reach game servers running on the
+    # same Komodo host. Docker Engine 20.10+ resolves this alias when the
+    # extra_hosts entry is present.
+    extra_hosts:
+      - "host.docker.internal:host-gateway"
     volumes:
       # in prod (Komodo host), the game server tree is at /root/zombies
       - /root/zombies:/root/zombies:rw
@@ -21,5 +26,6 @@ services:
       KOMODO_ADDRESS: ${KOMODO_ADDRESS}
       KOMODO_API_KEY: ${KOMODO_API_KEY}
       KOMODO_API_SECRET: ${KOMODO_API_SECRET}
-      IW4M_ADDRESS: ${IW4M_ADDRESS}
-      IW4M_CLIENT_ID: ${IW4M_CLIENT_ID}
+      RCON_PASSWORD: ${RCON_PASSWORD}
+      RCON_HOST: ${RCON_HOST:-host.docker.internal}
+      RCON_TIMEOUT_MS: ${RCON_TIMEOUT_MS:-3000}