Fix Apple Reject

Add:
- prisma/migrations/20251208042529_add_accepted_terms_at/
- prisma/schema.prisma.backup
- src/app/api/mobile/user/[id]/terms-of-app/

Fix:

prisma/schema.prisma
src/app/api/auth/mobile-register/route.ts
src/app/api/mobile/forum/[id]/report-commentar/route.ts
src/app/api/mobile/forum/[id]/report-posting/route.ts

### No Issue

prisma/schema.prisma

@@ -55,6 +55,9 @@ model User {
 
   blockedUsers BlockedUser[] @relation("Blocking")
   blockedBy    BlockedUser[] @relation("BlockedBy")
+
+  acceptedTermsAt      DateTime?
+  acceptedForumTermsAt DateTime?
 }
 
 model MasterUserRole {