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/en-US.json

@@ -638,8 +638,8 @@
       }
     },
     "clients": {
-      "tabBasic": "Basic",
-      "tabConfig": "Config",
+      "tabBasics": "Basics",
+      "tabCredentials": "Credentials",
       "add": "Add Client",
       "edit": "Edit Client",
       "submitAdd": "Add Client",
@@ -667,10 +667,11 @@
       "prefix": "Prefix",
       "postfix": "Postfix",
       "delayedStart": "Start After First Use",
-      "expireDays": "Duration",
+      "expireDays": "Duration (days)",
       "days": "Day(s)",
       "renew": "Auto Renew",
       "renewDesc": "Auto-renewal after expiration. (0 = disable)(unit: day)",
+      "renewDays": "Auto Renew (days)",
       "searchPlaceholder": "Search email, comment, sub ID, UUID, password, auth…",
       "filterTitle": "Filter clients",
       "clearAllFilters": "Clear all",
@@ -692,10 +693,12 @@
       "hasNot": "Doesn't have",
       "title": "Clients",
       "actions": "Actions",
-      "totalGB": "Total Sent/Received (GB)",
+      "totalGB": "Traffic Limit (GB)",
+      "totalGBDesc": "Data quota for this client. 0 = unlimited.",
       "expiryTime": "Expiry",
       "addClients": "Add Clients",
       "limitIp": "IP Limit",
+      "limitIpDesc": "Maximum simultaneous IPs. 0 = unlimited.",
       "password": "Password",
       "subId": "Subscription ID",
       "online": "Online",
@@ -1734,4 +1737,4 @@
       "chooseInbound": "Choose an Inbound"
     }
   }
-}
+}