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;

apps/backend/src/modules/user/services/user.service.ts

@@ -1,13 +1,19 @@
+import { createHash } from 'node:crypto';
 import type { User } from '@/lib/auth';
 import type { UserProfile } from '@repo/api-contract';
 
+function getGravatarUrl(email: string): string {
+  const hash = createHash('md5').update(email.trim().toLowerCase()).digest('hex');
+  return `https://www.gravatar.com/avatar/${hash}?d=identicon`;
+}
+
 export function getUserProfile(user: User): UserProfile {
   return {
     id: user.id,
     fullName: user.name,
     email: user.email,
     role: (user as any).role || 'member',
-    avatarUrl: user.image || null,
+    avatarUrl: user.image || getGravatarUrl(user.email),
     createdAt: user.createdAt,
   };
 }