Add password strength validation for signup

[C4aZy]

Pull Request

Description

Made the password strength stronger and made the password more than 8 characters rather than 6 characters.
Closes #476

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

[vercel]

@C4aZy is attempting to deploy a commit to the CodeBlooded's projects Team on Vercel.

A member of the Team first needs to authorize it.

[C4aZy]

@viru0909-dev Please review.

[vercel]

The latest updates on your projects. Learn more about Vercel for GitHub.

Project	Deployment	Actions	Updated (UTC)
nyaysetu	Ready	Preview, Comment	May 21, 2026 9:20am

[viru0909-dev]

@C4aZy The PR looks safe and beneficial overall — good security enhancement, improved UX, and the dual-layer validation is implemented correctly.

There is just one small must-fix issue before merging: in RegisterRequest.java, the validation error message still says "6 characters" while the actual requirement is 8 characters. Please update the message accordingly.

@C4aZy This should be a quick 2-minute fix. Once updated, the PR will be ready to merge.

[C4aZy]

@viru0909-dev Fixed it.Please review.