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

prisma/seed.ts

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