feat: 도메인 시스템 개선 + 검색 한글→영문 번역

주요 변경:
- Domain Agent 제거, 코드 직접 처리로 전환
- suggest_domains: 등록 가능 도메인만 표시, 10개 미만 시 재시도
- search_web: 한글 검색어 자동 영문 번역 (GPT-4o-mini)
- WHOIS: raw 데이터 파싱으로 상세 정보 추출
- 가격 조회: API 필드명 수정 (register_krw → krw)
- 동적 도구 로딩 시스템 추가
- 문서 정리 및 업데이트

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

src/index.ts

@@ -275,6 +275,121 @@ export default {
       }
     }
 
+    // Deposit API - 잔액 조회 (namecheap-api 전용)
+    if (url.pathname === '/api/deposit/balance' && request.method === 'GET') {
+      try {
+        const apiSecret = env.DEPOSIT_API_SECRET;
+        const authHeader = request.headers.get('X-API-Key');
+
+        if (!apiSecret || authHeader !== apiSecret) {
+          return Response.json({ error: 'Unauthorized' }, { status: 401 });
+        }
+
+        const telegramId = url.searchParams.get('telegram_id');
+        if (!telegramId) {
+          return Response.json({ error: 'telegram_id required' }, { status: 400 });
+        }
+
+        // 사용자 조회
+        const user = await env.DB.prepare(
+          'SELECT id FROM users WHERE telegram_id = ?'
+        ).bind(telegramId).first<{ id: number }>();
+
+        if (!user) {
+          return Response.json({ error: 'User not found' }, { status: 404 });
+        }
+
+        // 잔액 조회
+        const deposit = await env.DB.prepare(
+          'SELECT balance FROM user_deposits WHERE user_id = ?'
+        ).bind(user.id).first<{ balance: number }>();
+
+        return Response.json({
+          telegram_id: telegramId,
+          balance: deposit?.balance || 0,
+        });
+      } catch (error) {
+        console.error('[API] Deposit balance error:', error);
+        return Response.json({ error: String(error) }, { status: 500 });
+      }
+    }
+
+    // Deposit API - 잔액 차감 (namecheap-api 전용)
+    if (url.pathname === '/api/deposit/deduct' && request.method === 'POST') {
+      try {
+        const apiSecret = env.DEPOSIT_API_SECRET;
+        const authHeader = request.headers.get('X-API-Key');
+
+        if (!apiSecret || authHeader !== apiSecret) {
+          return Response.json({ error: 'Unauthorized' }, { status: 401 });
+        }
+
+        const body = await request.json() as {
+          telegram_id: string;
+          amount: number;
+          reason: string;
+          reference_id?: string;
+        };
+
+        if (!body.telegram_id || !body.amount || !body.reason) {
+          return Response.json({ error: 'telegram_id, amount, reason required' }, { status: 400 });
+        }
+
+        if (body.amount <= 0) {
+          return Response.json({ error: 'Amount must be positive' }, { status: 400 });
+        }
+
+        // 사용자 조회
+        const user = await env.DB.prepare(
+          'SELECT id FROM users WHERE telegram_id = ?'
+        ).bind(body.telegram_id).first<{ id: number }>();
+
+        if (!user) {
+          return Response.json({ error: 'User not found' }, { status: 404 });
+        }
+
+        // 현재 잔액 확인
+        const deposit = await env.DB.prepare(
+          'SELECT balance FROM user_deposits WHERE user_id = ?'
+        ).bind(user.id).first<{ balance: number }>();
+
+        const currentBalance = deposit?.balance || 0;
+        if (currentBalance < body.amount) {
+          return Response.json({
+            error: 'Insufficient balance',
+            current_balance: currentBalance,
+            required: body.amount,
+          }, { status: 400 });
+        }
+
+        // 트랜잭션: 잔액 차감 + 거래 기록
+        await env.DB.batch([
+          env.DB.prepare(
+            'UPDATE user_deposits SET balance = balance - ?, updated_at = CURRENT_TIMESTAMP WHERE user_id = ?'
+          ).bind(body.amount, user.id),
+          env.DB.prepare(
+            `INSERT INTO deposit_transactions (user_id, type, amount, status, description, confirmed_at)
+             VALUES (?, 'deduct', ?, 'confirmed', ?, CURRENT_TIMESTAMP)`
+          ).bind(user.id, body.amount, body.reason),
+        ]);
+
+        const newBalance = currentBalance - body.amount;
+
+        console.log(`[API] Deposit deducted: user=${body.telegram_id}, amount=${body.amount}, reason=${body.reason}`);
+
+        return Response.json({
+          success: true,
+          telegram_id: body.telegram_id,
+          deducted: body.amount,
+          previous_balance: currentBalance,
+          new_balance: newBalance,
+        });
+      } catch (error) {
+        console.error('[API] Deposit deduct error:', error);
+        return Response.json({ error: String(error) }, { status: 500 });
+      }
+    }
+
     // Telegram Webhook 처리
     if (url.pathname === '/webhook') {
       // 보안 검증