feat: add server selection and order flow after recommendation

- Add 'selecting' and 'ordering' status to ServerSession
- Add lastRecommendation field to store recommendation results
- Keep session alive after recommendation (don't delete immediately)
- Add selection pattern matching (1번, 첫번째, 1번 선택 등)
- Add order confirmation message with inline buttons
- Add server_order/server_cancel callback handlers
- Add ServerOrderKeyboardData type for button data

Flow: recommend → select number → confirm with buttons → order/cancel

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/routes/handlers/callback-handler.ts

@@ -119,6 +119,122 @@ ${result.error}
     return;
   }
 
+  // 서버 주문 확인
+  if (data.startsWith('server_order:')) {
+    const parts = data.split(':');
+    if (parts.length !== 3) {
+      await answerCallbackQuery(env.BOT_TOKEN, queryId, { text: '잘못된 데이터입니다.' });
+      return;
+    }
+
+    const userId = parts[1];
+    const index = parseInt(parts[2], 10);
+
+    if (isNaN(index) || index < 0 || index > 2) {
+      await answerCallbackQuery(env.BOT_TOKEN, queryId, { text: '잘못된 선택입니다.' });
+      return;
+    }
+
+    await answerCallbackQuery(env.BOT_TOKEN, queryId, { text: '처리 중...' });
+    await editMessageText(
+      env.BOT_TOKEN,
+      chatId,
+      messageId,
+      '⏳ 서버 주문 처리 중...'
+    );
+
+    // 세션 조회
+    const { getServerSession, deleteServerSession } = await import('../../server-agent');
+
+    if (!env.SESSION_KV) {
+      await editMessageText(
+        env.BOT_TOKEN,
+        chatId,
+        messageId,
+        '❌ 세션 저장소가 설정되지 않았습니다.'
+      );
+      return;
+    }
+
+    const session = await getServerSession(env.SESSION_KV, userId);
+
+    if (!session || !session.lastRecommendation) {
+      await editMessageText(
+        env.BOT_TOKEN,
+        chatId,
+        messageId,
+        '❌ 세션이 만료되었습니다.\n다시 "서버 추천"을 시작해주세요.'
+      );
+      return;
+    }
+
+    const selected = session.lastRecommendation.recommendations[index];
+
+    if (!selected) {
+      await editMessageText(
+        env.BOT_TOKEN,
+        chatId,
+        messageId,
+        '❌ 선택한 서버를 찾을 수 없습니다.'
+      );
+      await deleteServerSession(env.SESSION_KV, userId);
+      return;
+    }
+
+    // 주문 처리 (현재는 준비 중)
+    const { executeServerAction } = await import('../../tools/server-tool');
+
+    const result = await executeServerAction(
+      'order',
+      {
+        server_id: selected.plan_name, // 임시
+        region_code: selected.region.code,
+        label: `${session.collectedInfo.useCase || 'server'}-1`
+      },
+      env,
+      userId
+    );
+
+    await editMessageText(
+      env.BOT_TOKEN,
+      chatId,
+      messageId,
+      `📋 ${selected.plan_name} 신청\n\n${result}`
+    );
+
+    // 세션 삭제
+    await deleteServerSession(env.SESSION_KV, userId);
+    return;
+  }
+
+  // 서버 주문 취소
+  if (data.startsWith('server_cancel:')) {
+    const parts = data.split(':');
+    if (parts.length !== 2) {
+      await answerCallbackQuery(env.BOT_TOKEN, queryId, { text: '잘못된 데이터입니다.' });
+      return;
+    }
+
+    const userId = parts[1];
+
+    await answerCallbackQuery(env.BOT_TOKEN, queryId, { text: '취소되었습니다.' });
+    await editMessageText(
+      env.BOT_TOKEN,
+      chatId,
+      messageId,
+      '❌ 서버 신청이 취소되었습니다.'
+    );
+
+    // 세션 삭제
+    const { deleteServerSession } = await import('../../server-agent');
+
+    if (env.SESSION_KV) {
+      await deleteServerSession(env.SESSION_KV, userId);
+    }
+
+    return;
+  }
+
   // 알 수 없는 callback data
   await answerCallbackQuery(env.BOT_TOKEN, queryId);
 }