feat(ui): improve client form modal UX

- Rename tabs: "Basic" → "Basics", "Config" → "Credentials"
- Move reverseTag field from Credentials tab to Basics tab
- Move IP log button inline with limitIp field (tooltip button, edit mode only)
- Hide random email button when editing an existing client
- Add tooltips to totalGB and limitIp fields with descriptive hints
- Rename labels: "Total Sent/Received (GB)" → "Traffic Limit (GB)", "Duration" → "Duration (days)"
- Add renewDays translation key for auto-renew label with unit hint
- Remove redundant filterOption and width style from AutoComplete group selectors
- Update all 15 locale files with new and renamed translation keys

internal/web/translation/ja-JP.json

@@ -637,8 +637,8 @@
       }
     },
     "clients": {
-      "tabBasic": "基本",
-      "tabConfig": "設定",
+      "tabBasics": "基本",
+      "tabCredentials": "認証情報",
       "add": "クライアントを追加",
       "edit": "クライアントを編集",
       "submitAdd": "クライアントを追加",
@@ -666,10 +666,11 @@
       "prefix": "プレフィックス",
       "postfix": "サフィックス",
       "delayedStart": "初回使用から開始",
-      "expireDays": "期間",
+      "expireDays": "期間 (日)",
       "days": "日",
       "renew": "自動更新",
       "renewDesc": "有効期限切れ後に自動更新します。(0 = 無効) (単位: 日)",
+      "renewDays": "自動更新 (日)",
       "searchPlaceholder": "メール、コメント、sub ID、UUID、パスワード、auth を検索…",
       "filterTitle": "クライアントをフィルタ",
       "clearAllFilters": "すべてクリア",
@@ -691,10 +692,12 @@
       "hasNot": "なし",
       "title": "クライアント",
       "actions": "操作",
-      "totalGB": "送受信合計 (GB)",
+      "totalGB": "トラフィック上限 (GB)",
+      "totalGBDesc": "このクライアントのデータ割当量。0 = 無制限。",
       "expiryTime": "有効期限",
       "addClients": "クライアントを追加",
       "limitIp": "IP 制限",
+      "limitIpDesc": "同時接続 IP の最大数。0 = 無制限。",
       "password": "パスワード",
       "subId": "サブスクリプション ID",
       "online": "オンライン",
@@ -1733,4 +1736,4 @@
       "chooseInbound": "インバウンドを選択"
     }
   }
-}
+}