refactor: Update user creation logic in UserService

src/modules/user/user.service.ts

@@ -59,13 +59,17 @@ export class UserService {
 			},
 		});
 
-		if (!user)
+		if (!user) {
+			const isFirstUser = (await this.prisma.user.count()) === 0;
+
 			user = await this.prisma.user.create({
 				data: {
-					providerId,
 					username,
+					providerId,
+					role: isFirstUser ? "ADMIN" : "STUDENT",
 				},
 			});
+		}
 
 		return user;
 	}