feat: 도메인 정보 조회 개선

- get_domain_info 민감정보 필터링 (계정 ID 제거)
- whois_lookup 도구 추가 (Domain Agent)
- .it.com ccSLD WHOIS 미지원 안내 추가
- domain-agent tools.ts에 whois_lookup 추가

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

src/openai-service.ts

@@ -184,10 +184,22 @@ async function callNamecheapApi(funcName: string, funcArgs: Record<string, any>,
       // 허용된 도메인만 필터링
       return result.filter((d: any) => allowedDomains.includes(d.name));
     }
-    case 'get_domain_info':
+    case 'get_domain_info': {
-      return fetch(`${apiUrl}/domains/${funcArgs.domain}`, {
+      const domainInfo = await fetch(`${apiUrl}/domains/${funcArgs.domain}`, {
         headers: { 'X-API-Key': apiKey },
-      }).then(r => r.json());
+      }).then(r => r.json()) as any;
+      // 민감 정보 필터링 (계정 ID 등)
+      return {
+        domain: domainInfo.name || funcArgs.domain,
+        status: domainInfo.status,
+        created: domainInfo.created,
+        expires: domainInfo.expires,
+        auto_renew: domainInfo.auto_renew,
+        is_locked: domainInfo.is_locked,
+        is_premium: domainInfo.is_premium,
+        nameservers: domainInfo.nameservers,
+      };
+    }
     case 'get_nameservers':
       return fetch(`${apiUrl}/dns/${funcArgs.domain}/nameservers`, {
         headers: { 'X-API-Key': apiKey },