feat(sub): allow identity tokens on every subscription link (#5935)

Keep usage tokens first-link-only while adding an opt-in setting for repeating EMAIL and USERNAME in subscription-body remarks.

Co-authored-by: x06579 <x06579@ai-dashboard>

frontend/src/schemas/setting.ts

@@ -18,6 +18,7 @@ export const AllSettingSchema = z.object({
   expireDiff: nonNegativeInt.optional(),
   trafficDiff: nonNegativeInt.max(100).optional(),
   remarkTemplate: z.string().optional(),
+  subShowIdentityOnAllLinks: z.boolean().optional(),
   datepicker: z.enum(['gregorian', 'jalalian']).optional(),
   tgBotEnable: z.boolean().optional(),
   tgBotToken: z.string().optional(),