fix: update invitation email domain configuration

- Changed the domain used in the invitation email link to utilize the NEXT_PUBLIC_BETTER_AUTH_URL environment variable for better flexibility in production environments.
- This update ensures that the correct domain is used based on the environment, improving the invitation email functionality.

Author: claudfuen

apps/portal/src/app/lib/auth.ts

@@ -28,7 +28,7 @@ export const auth = betterAuth({
       async sendInvitationEmail(data) {
         const isLocalhost = process.env.NODE_ENV === 'development';
         const protocol = isLocalhost ? 'http' : 'https';
-        const domain = isLocalhost ? 'localhost:3000' : 'app.trycomp.ai';
+        const domain = isLocalhost ? 'localhost:3000' : process.env.NEXT_PUBLIC_BETTER_AUTH_URL!;
         const inviteLink = `${protocol}://${domain}/invite/${data.invitation.id}`;
 
         const url = `${protocol}://${domain}/auth`;