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/schemas/setting.ts

@@ -21,6 +21,9 @@ export const AllSettingSchema = z
     trafficDiff: nonNegativeInt.max(100).optional(),
     remarkTemplate: z.string().optional(),
     subShowIdentityOnAllLinks: z.boolean().optional(),
+    subInfoNodeEnable: z.boolean().optional(),
+    subExpiredTemplate: z.string().optional(),
+    subTrafficDepletedTemplate: z.string().optional(),
     datepicker: z.enum(['gregorian', 'jalalian']).optional(),
     tgBotEnable: z.boolean().optional(),
     tgBotToken: z.string().optional(),