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/pages/settings/SubscriptionGeneralTab.tsx

@@ -182,6 +182,41 @@ export default function SubscriptionGeneralTab({
                 />
               </SettingListItem>
 
+              <SettingListItem
+                paddings="small"
+                title={t('pages.settings.subInfoNodeEnable')}
+                description={t('pages.settings.subInfoNodeEnableDesc')}
+              >
+                <Switch
+                  checked={allSetting.subInfoNodeEnable}
+                  onChange={(v) => updateSetting({ subInfoNodeEnable: v })}
+                />
+              </SettingListItem>
+
+              <SettingListItem
+                paddings="small"
+                title={t('pages.settings.subExpiredTemplate')}
+                description={t('pages.settings.subExpiredTemplateDesc')}
+              >
+                <RemarkTemplateField
+                  value={allSetting.subExpiredTemplate}
+                  onChange={(v) => updateSetting({ subExpiredTemplate: v })}
+                  maxLength={256}
+                />
+              </SettingListItem>
+
+              <SettingListItem
+                paddings="small"
+                title={t('pages.settings.subTrafficDepletedTemplate')}
+                description={t('pages.settings.subTrafficDepletedTemplateDesc')}
+              >
+                <RemarkTemplateField
+                  value={allSetting.subTrafficDepletedTemplate}
+                  onChange={(v) => updateSetting({ subTrafficDepletedTemplate: v })}
+                  maxLength={256}
+                />
+              </SettingListItem>
+
               <SettingListItem
                 paddings="small"
                 title={t('pages.settings.subUpdates')}