feat(sub): add dummy info node and status configs for subscriptions (#6412)

* feat(settings): add subInfoNodeEnable and status template settings

* feat(sub): add dummy info node and status configs for raw links

* feat(sub): support dummy info node in clash and json subscriptions

* feat(ui): add subscription info node switch and status templates to settings

* style: apply gofumpt formatting

* fix(sub): address review feedback on subscription info node

- Restore GetSubs contract to avoid unintended remark expansions on non-subscription-body calls.
- Exclude dummy info node from Clash PROXY select group when active server nodes exist.
- Track hasEnabledClient and set traffic.Enable in JSON and Clash paths so status tokens evaluate correctly.
- Deterministically sort client emails across subscriptions before selecting primaryEmail.
- Consolidate duplicated info-node evaluation logic into resolveInfoNodeRemark helper.
- Remove redundant pure-getter test from setting_sub_info_node_test.go.

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

---------

Co-authored-by: Claude Code <noreply@anthropic.com>

frontend/src/models/setting.ts

@@ -16,6 +16,10 @@ export class AllSetting {
   trafficDiff = 0;
   remarkTemplate = '{{INBOUND}}-{{EMAIL}}|📊{{TRAFFIC_LEFT}}|⏳{{DAYS_LEFT}}D';
   subShowIdentityOnAllLinks = false;
+  subInfoNodeEnable = false;
+  subExpiredTemplate = '⛔ {{EMAIL}} | Expired: {{EXPIRE_DATE}}';
+  subTrafficDepletedTemplate =
+    '🚫 {{EMAIL}} | Traffic Depleted | {{TRAFFIC_USED}}/{{TRAFFIC_TOTAL}}';
   datepicker: 'gregorian' | 'jalalian' = 'gregorian';
   tgBotEnable = false;
   tgBotToken = '';