Switch to chips-only play: real cards at the table, winners picked on screen

- Remove the deck, hole cards, board, hand evaluator and reveal logic
  (cards are dealt physically; the site only tracks bets, pots and stacks)
- Showdown now waits for a winner per pot (main/side), chosen by a player
  still in the hand or the host; multiple winners split the pot
- All-in with no further betting goes straight to showdown
- Remove the 30s action clock / auto sit-out (everyone is at the same table)
- UI: winner picker panel (main winner auto-fills side pots), compact table

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

server/config.js

@@ -53,12 +53,8 @@ module.exports = {
   // 誰も接続していないテーブルを削除するまでの時間
   EMPTY_TABLE_TTL_MS: 30 * 60 * 1000,
 
-  // 1手の持ち時間。過ぎると自動でチェック/フォールドして離席扱い
-  ACTION_TIME_MS: 30 * 1000,
-  // オールインで残りのカードをめくる間隔
-  RUNOUT_STEP_MS: 1500,
   // ハンド終了後、次のハンドまで結果を表示する時間
-  SHOWDOWN_MS: 5000,
+  SHOWDOWN_MS: 4000,
   FOLD_WIN_MS: 2500,
   // 参加者が2人揃ってから次のハンドを始めるまで
   NEXT_HAND_DELAY_MS: 2000,