settings trim: remove dead settings, upstream remnants, JSON/Clash subscriptions

Per SETTINGS-AUDIT (all three tiers approved 2026-10-23):

Dead settings:
- panelOutbound, ipLimitAllowlist (+ orphan parser job), outboundDownThreshold
- tg fake events outbound.down/outbound.up/xray.crash (no publisher in lite)
- phantom routing sub-tabs (Happ/Clash/Incy) and subJsonRules direct-rules tab
  (no backend keys); subHideSettings moved to the subscription info tab first

Upstream remnants:
- ldap* / smtp* model+schema keys, EmailNotifications orphan component
- twoFactorEnable/twoFactorToken + login-page probe (no backend handler)
- externalTrafficInform*

Newly approved removals:
- JSON subscription family (producer, routes, UA auto-detect, mux/finalmask/
  observatory) and Clash subscription family (producer, routes, UA detect)
- SubBalancer (table, service, controller, settings tab)
- subThemeDir (subscription page falls back to the built-in template)
- datepicker jalalian option (gregorian only; Persian picker removed)

JSON/Clash endpoints now 404; link-format output pinned by regression tests.
Guarded keys untouched: webListen/webPort/webBasePath/certs, tg* chain,
expireDiff/trafficDiff/tgBotProxy, subHideSettings, pageSize/tgLang.

frontend/src/pages/inbounds/info/InboundInfoModal.tsx

@@ -54,7 +54,6 @@ export default function InboundInfoModal({
   const [amneziawgConfigs, setAmneziawgConfigs] = useState<string[]>([]);
   const [amneziawgLinks, setAmneziawgLinks] = useState<string[]>([]);
   const [subLink, setSubLink] = useState('');
-  const [subJsonLink, setSubJsonLink] = useState('');
   const [refreshing, setRefreshing] = useState(false);
   const [clientIpsArray, setClientIpsArray] = useState<string[]>([]);
   const [clientIpsText, setClientIpsText] = useState('');
@@ -198,12 +197,8 @@ export default function InboundInfoModal({
 
     if (clientSet?.subId) {
       setSubLink((subSettings?.subURI || '') + clientSet.subId);
-      setSubJsonLink(
-        subSettings?.subJsonEnable ? (subSettings?.subJsonURI || '') + clientSet.subId : '',
-      );
     } else {
       setSubLink('');
-      setSubJsonLink('');
     }
 
     setClientIpsArray([]);
@@ -575,29 +570,6 @@ export default function InboundInfoModal({
               {subLink}
             </a>
           </div>
-          {subSettings?.subJsonEnable && subJsonLink && (
-            <div className="link-panel">
-              <div className="link-panel-header">
-                <Tag color="green">JSON</Tag>
-                <Tooltip title={t('copy')}>
-                  <Button
-                    size="small"
-                    icon={<CopyOutlined />}
-                    aria-label={t('copy')}
-                    onClick={() => copyText(subJsonLink, t)}
-                  />
-                </Tooltip>
-              </div>
-              <a
-                href={subJsonLink}
-                target="_blank"
-                rel="noopener noreferrer"
-                className="link-panel-anchor"
-              >
-                {subJsonLink}
-              </a>
-            </div>
-          )}
         </>
       )}
     </>