fix(bot): include quiet promotions in quiescence search

Quiescence tactical filter only flagged capture-promotions, so a quiet
queening on an empty back-rank square was treated as non-tactical and
skipped at the search horizon. A bot could therefore miss a winning
promotion sitting exactly at the horizon and play another move. All bots
(Classical/NNUE/Hybrid) share AlphaBetaSearch and were affected.

Treat every promotion as tactical so quiescence always expands it.

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

modules/official-bots/src/main/scala/de/nowchess/bot/logic/AlphaBetaSearch.scala

@@ -468,5 +468,5 @@ final class AlphaBetaSearch(
   private def isCapture(context: GameContext, move: Move): Boolean = move.moveType match
     case MoveType.Normal(true) => true
     case MoveType.EnPassant    => true
-    case MoveType.Promotion(_) => context.board.pieceAt(move.to).exists(_.color != context.turn)
+    case MoveType.Promotion(_) => true
     case _                     => false