2つ目のgmailアカウントを処理

frontend/src/app/mail/history/page.tsx

@@ -31,7 +31,7 @@ const ACCOUNT_LABELS: Record<string, string> = {
   gmail: 'Gmail',
   hotmail: 'Hotmail',
   xserver: 'Xserver',
-  infoseek: 'Infoseek (転送)',
+  gmail_service: 'Gmail (サービス用)',
 };
 
 export default function MailHistoryPage() {
@@ -98,7 +98,7 @@ export default function MailHistoryPage() {
             <option value="gmail">Gmail</option>
             <option value="hotmail">Hotmail</option>
             <option value="xserver">Xserver</option>
-            <option value="infoseek">Infoseek (転送)</option>
+            <option value="gmail_service">Gmail (サービス用)</option>
           </select>
           <select
             value={filterVerdict}