Add a button to copy a hand's situation as an AI prompt

Reviews and replays get a "copy for AI" button that builds a text
describing the hand (stacks, positions, actions, pots, board, revealed
cards, result and the site's own judgments) plus questions, ready to
paste into an AI chat. Hidden opponent cards are left out so the
evaluation is based only on what Hero could see.

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

server/index.js

@@ -9,6 +9,7 @@ const auth = require('./auth');
 const { TableManager, MODES } = require('./tables');
 const reviews = require('./review/store');
 const { summarize } = require('./review/summary');
+const { buildHandPrompt } = require('./review/prompt');
 
 const PUBLIC = path.join(__dirname, '..', 'public');
 // 管理者専用のファイル（public の外に置き、管理者の Cookie があるときだけ返す）
@@ -122,6 +123,17 @@ app.get('/api/reviews/:id', auth.requireAdmin, async (req, res, next) => {
     next(err);
   }
 });
+// 1ハンドの状況を AI に質問するための文章
+app.get('/api/reviews/:id/hands/:number/prompt', auth.requireAdmin, async (req, res, next) => {
+  try {
+    const session = await reviews.get(req.params.id);
+    const hand = session && session.hands.find((h) => String(h.number) === req.params.number);
+    if (!hand) return res.status(404).json({ error: '見つかりません' });
+    res.json({ text: buildHandPrompt(hand) });
+  } catch (err) {
+    next(err);
+  }
+});
 
 app.get('/api/me', (req, res) => res.json({ admin: auth.isAdmin(req) }));
 app.get('/api/tables', (req, res) => res.json(tables.list(auth.isAdmin(req))));