feat: add user role field and implement Gravatar fallback for user avatars

apps/backend/src/lib/auth.ts

@@ -1,6 +1,5 @@
 import { betterAuth } from 'better-auth';
 import { prismaAdapter } from 'better-auth/adapters/prisma';
-// If your Prisma file is located elsewhere, you can change the path
 import { openAPI } from 'better-auth/plugins';
 import { db } from './prisma';
 
@@ -19,7 +18,7 @@ export const auth = betterAuth({
     enabled: true,
   },
   trustedOrigins: [process.env.APP_BASE_URL ?? 'http://localhost:5173'],
-  plugins: [],
+  plugins: [openAPI()],
 });
 
 export type Session = typeof auth.$Infer.Session.session;