fix(official-bots): play only own tournament games with correct color

The tournament stream broadcasts a gameStart per color for every pairing in
the round, without a player id. The bot latched the first color it saw and
played games it was not part of, submitting moves for the wrong color that
the server rejected. Now it fetches game detail and matches its botId against
white/black to resolve its real color, skipping games it is not in.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

modules/official-bots/src/main/scala/de/nowchess/bot/service/TournamentBotGamePlayer.scala

@@ -283,12 +283,35 @@ class TournamentBotGamePlayer:
       forEachLine(response.readEntity(classOf[InputStream])): line =>
         parse(line).foreach: node =>
           if node.path("type").asText() == "gameStart" then
-            onGameStart(cfg, node.path("gameId").asText(), node.path("color").asText())
+            onGameStart(cfg, node.path("gameId").asText())
 
-  private def onGameStart(cfg: TournamentBotConfig, gameId: String, color: String): Unit =
-    if gameId.nonEmpty && color.nonEmpty && activeGames.add(gameId) then
-      workers.submit(new Runnable { def run(): Unit = playGame(cfg, gameId, color) })
-      ()
+  private def onGameStart(cfg: TournamentBotConfig, gameId: String): Unit =
+    if gameId.isEmpty then ()
+    else
+      resolveColor(cfg, gameId) match
+        case None => log.debugf("Ignoring game %s — bot %s is not a participant", gameId, cfg.botId)
+        case Some(color) =>
+          if activeGames.add(gameId) then
+            workers.submit(new Runnable { def run(): Unit = playGame(cfg, gameId, color) })
+            ()
+
+  private def resolveColor(cfg: TournamentBotConfig, gameId: String): Option[String] =
+    fetchGame(cfg, gameId).flatMap { node =>
+      val whiteId = node.path("white").path("id").asText()
+      val blackId = node.path("black").path("id").asText()
+      if whiteId == cfg.botId then Some("white")
+      else if blackId == cfg.botId then Some("black")
+      else None
+    }
+
+  private def fetchGame(cfg: TournamentBotConfig, gameId: String): Option[JsonNode] =
+    Try {
+      val response = authed(cfg, target(cfg).path("game").path(gameId)).get()
+      try
+        if response.getStatus == 200 then Some(objectMapper.readTree(response.readEntity(classOf[String])))
+        else { log.warnf("Game detail %s returned status %d", gameId, response.getStatus); None }
+      finally response.close()
+    }.getOrElse(None)
 
   private def playGame(cfg: TournamentBotConfig, gameId: String, color: String): Unit =
     Try {