feat: implement admin authentication, role-based permissions, and backoffice layout components

prisma/schema.prisma

@@ -40,6 +40,8 @@ model User {
   deletionScheduledAt DateTime?
   deletionReason    String?
   reactivationReason String?
+  adminRole         String?                   @default("ADMIN")
+  adminPermissions  String[]                  @default([])
 }
 
 model Business {

prisma/seed.ts

@@ -61,6 +61,8 @@ async function main() {
       email: 'admin@afrohub.com',
       password: hashedPassword,
       role: UserRole.ADMIN,
+      adminRole: 'SUPER_ADMIN',
+      adminPermissions: [],
     }
   });