refactor: integrate Better-Auth for authentication and remove Supabase dependencies

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

@@ -1,23 +1,13 @@
-import type { AuthUser } from '@/types/auth-user';
+import type { User } from '@/lib/auth';
 import type { UserProfile } from '@repo/api-contract';
 
-export function getUserProfile(user: AuthUser): UserProfile {
-  const fullName =
-    (typeof user.user_metadata?.full_name === 'string' && user.user_metadata.full_name) ||
-    (typeof user.user_metadata?.name === 'string' && user.user_metadata.name) ||
-    (user.email ?? 'Usuario');
-
-  const role = (typeof user.app_metadata?.role === 'string' && user.app_metadata.role) || 'member';
-
-  const avatarUrl =
-    (typeof user.user_metadata?.avatar_url === 'string' && user.user_metadata.avatar_url) || null;
-
+export function getUserProfile(user: User): UserProfile {
   return {
     id: user.id,
-    fullName,
-    email: user.email ?? null,
-    role,
-    avatarUrl,
-    createdAt: user.created_at,
+    fullName: user.name,
+    email: user.email,
+    role: (user as any).role || 'member',
+    avatarUrl: user.image || null,
+    createdAt: user.createdAt,
   };
 }