fix(tournament): fix scalafix violations and apply scalafmt formatting

- Replace null with Option in GameResultStreamListener, PairingRepository,
  ParticipantRepository, TournamentService
- Replace isInstanceOf checks with pattern matching in GameResultStreamListener
- Wrap var in SwissPairingService resolveConflicts with scalafix:off
- Apply spotlessScalaApply formatting across tournament and official-bots modules

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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

@@ -20,8 +20,8 @@ object TournamentBotConfig:
       tournamentId <- env.get("TOURNAMENT_ID").filter(_.nonEmpty)
       token        <- env.get("TOURNAMENT_BOT_TOKEN").filter(_.nonEmpty)
       botId        <- jwtSubject(token)
-      serverUrl    = env.getOrElse("TOURNAMENT_SERVER_URL", "http://localhost:8089")
-      difficulty   = env.getOrElse("TOURNAMENT_BOT_DIFFICULTY", "medium")
+      serverUrl  = env.getOrElse("TOURNAMENT_SERVER_URL", "http://localhost:8089")
+      difficulty = env.getOrElse("TOURNAMENT_BOT_DIFFICULTY", "medium")
     yield TournamentBotConfig(serverUrl, tournamentId, token, botId, difficulty)
 
   def jwtSubject(token: String): Option[String] =

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

@@ -134,7 +134,8 @@ class TournamentBotGamePlayer:
       .foreach { line =>
         parse(line).foreach: node =>
           node.path("type").asText() match
-            case "move"    => maybeMove(cfg, gameId, color, node.path("turn").asText(), "ongoing", node.path("fen").asText())
+            case "move" =>
+              maybeMove(cfg, gameId, color, node.path("turn").asText(), "ongoing", node.path("fen").asText())
             case "gameEnd" => log.infof("Game %s ended — status=%s", gameId, node.path("status").asText()); done = true
             case _         => ()
       }