Add Swagger Documentation for Backend APIs

[swanith1234]

Is your feature request related to a problem or challenge?

Frontend developers and contributors currently rely on manual explanations or reading backend code to understand API usage, which slows down integration.

Describe the solution you'd like

Introduce Swagger (OpenAPI) documentation for all backend authentication APIs. Swagger UI should be hosted locally for easy testing and kept up-to-date automatically as APIs evolve.

Describe alternatives you've considered

No response

Additional context

Swagger will ensure better collaboration and faster onboarding of new developers.

[github-actions]

Thank you for raising this issue!

We'll review it as soon as possible. We truly appreciate your contributions! ✨

Meanwhile make sure you've visited the README.md, CONTRIBUTING.md, and CODE_OF_CONDUCT.md before creating a PR for this. Also, please do NOT create a PR until this issue has been assigned to you. 😊

[omroy07]

Assigned

[Aditya8369]

@omroy07 please assign me under NSOC

[omroy07]

Assigned