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.

src/routes/servers/[name]/+page.svelte

@@ -8,8 +8,8 @@
         komodo_type: string;
         komodo_name: string;
         komodo_server: string | null;
-        iw4m_match: string | null;
-        iw4m_value: string | null;
+        game_port: number | null;
+        rcon_host: string | null;
         last_players: number | null;
         last_checked_at: string | null;
         held: Array<{ target: string; slug: string }>;
@@ -49,8 +49,12 @@
             <div class="v">{server.komodo_type} · {server.komodo_name}</div>
         </div>
         <div class="stat">
-            <div class="k">iw4m</div>
-            <div class="v">{server.iw4m_match ?? '—'} · {server.iw4m_value ?? '—'}</div>
+            <div class="k">rcon</div>
+            <div class="v">{server.rcon_host ?? 'default'} · port {server.game_port ?? '—'}</div>
+        </div>
+        <div class="stat">
+            <div class="k">last check</div>
+            <div class="v">{server.last_checked_at ?? '—'}</div>
         </div>
         <div class="stat">
             <div class="k">held by beta</div>