feat: add default admin user seeding on first server start

[Aharshi3614]

Description

When users clone and run the project for the first time, they have no login credentials. They need to manually register or figure out how to create an admin user.

Goals

• Automatically create a default admin user on first server start
• Provide default credentials in documentation
• Allow users to login immediately after setup

Implementation

• Check if any admin user exists
• If none exists, create default admin
• Use environment variables for credentials
• Log credentials on first start

[github-actions]

👋 Welcome back! Thanks for your continued contribution. Your issue/PR is received and waiting for maintainer review.

[github-actions]

The proposal suggests adding functionality to automatically create a default admin user with environment-based credentials during the first server start if no admin users exist. This would streamline initial setup, allow immediate login, and include documentation for the default credentials.

[Userunknown84]

If user login n some random id then user can't login and it just like a guest feature . In other way we can do is make a guest account with random id but user has limit feature to use like sms, email, url manual not other feature.

[Aharshi3614]

I understand the approach. Instead of creating a default admin, I'll implement a Guest Account feature.

Can I work on it then?

[Userunknown84]

Yeah go a head