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/cards.js

@@ -1,96 +0,0 @@
-'use strict';
-
-const crypto = require('crypto');
-
-// カードは "As"（スペードのA）, "Td"（ダイヤの10）のような2文字
-const RANKS = '23456789TJQKA';
-const SUITS = 'shdc';
-
-// 暗号論的乱数で Fisher-Yates シャッフル（山札はサーバの外に出さない）
-function newDeck() {
-  const deck = [];
-  for (const r of RANKS) for (const s of SUITS) deck.push(r + s);
-  for (let i = deck.length - 1; i > 0; i--) {
-    const j = crypto.randomInt(i + 1);
-    [deck[i], deck[j]] = [deck[j], deck[i]];
-  }
-  return deck;
-}
-
-const rankValue = (card) => RANKS.indexOf(card[0]) + 2;
-
-// 5枚の役の強さ。配列を先頭から比較して大きいほうが強い
-// [役の種類(0〜8), 比較用の数字...]
-function score5(cards) {
-  const vals = cards.map(rankValue).sort((a, b) => b - a);
-  const flush = cards.every((c) => c[1] === cards[0][1]);
-
-  let straightHigh = 0;
-  if (new Set(vals).size === 5) {
-    if (vals[0] - vals[4] === 4) straightHigh = vals[0];
-    else if (vals[0] === 14 && vals[1] === 5) straightHigh = 5; // A-2-3-4-5
-  }
-  if (straightHigh && flush) return [8, straightHigh];
-
-  // 枚数の多い順、同じ枚数なら数字の大きい順
-  const counts = new Map();
-  for (const v of vals) counts.set(v, (counts.get(v) || 0) + 1);
-  const groups = [...counts].sort((a, b) => b[1] - a[1] || b[0] - a[0]);
-  const byGroup = groups.map((g) => g[0]);
-
-  if (groups[0][1] === 4) return [7, ...byGroup];
-  if (groups[0][1] === 3 && groups[1][1] === 2) return [6, ...byGroup];
-  if (flush) return [5, ...vals];
-  if (straightHigh) return [4, straightHigh];
-  if (groups[0][1] === 3) return [3, ...byGroup];
-  if (groups[0][1] === 2 && groups[1][1] === 2) return [2, ...byGroup];
-  if (groups[0][1] === 2) return [1, ...byGroup];
-  return [0, ...vals];
-}
-
-function compareScore(a, b) {
-  for (let i = 0; i < Math.max(a.length, b.length); i++) {
-    const d = (a[i] || 0) - (b[i] || 0);
-    if (d) return d;
-  }
-  return 0;
-}
-
-const HAND_NAMES = [
-  'ハイカード',
-  'ワンペア',
-  'ツーペア',
-  'スリーカード',
-  'ストレート',
-  'フラッシュ',
-  'フルハウス',
-  'フォーカード',
-  'ストレートフラッシュ',
-];
-
-function handName(score) {
-  if (score[0] === 8 && score[1] === 14) return 'ロイヤルフラッシュ';
-  return HAND_NAMES[score[0]];
-}
-
-// 5〜7枚から最も強い5枚を選ぶ
-function bestHand(cards) {
-  let best = null;
-  const n = cards.length;
-  const pick = (start, chosen) => {
-    if (chosen.length === 5) {
-      const score = score5(chosen);
-      if (!best || compareScore(score, best.score) > 0) best = { score, cards: chosen.slice() };
-      return;
-    }
-    for (let i = start; i <= n - (5 - chosen.length); i++) {
-      chosen.push(cards[i]);
-      pick(i + 1, chosen);
-      chosen.pop();
-    }
-  };
-  pick(0, []);
-  return best && { score: best.score, cards: best.cards, name: handName(best.score) };
-}
-
-module.exports = { newDeck, score5, compareScore, bestHand, handName };