Add validation for username, firstname, lastname, and password fields

[prakrutipathak]

Pull Request Template

Title: Add validation for username, firstname, lastname, and password fields

Description

This PR adds validation to the registration form to ensure proper input for the username, firstname, lastname, and password fields. Previously, users could register with just one character in these fields, and there was no password strength validation.

Changes Made

• Added validation to ensure the username, firstname, and lastname fields have a minimum of 2 characters and do not allow digits.
• Implemented password validation requiring a minimum of 8 characters, with at least one digit and one special character.

Related Issue

Fixes #64

Checklist

• [x] I have tested my code and it works as expected.
• [ ] I have added/updated documentation where necessary.
• [ ] I have included tests for new features.
• [x] I have followed the project's coding standards.

Screenshots (if applicable)

https://github.com/user-attachments/assets/7662df49-5b2c-4678-a3e7-79d05be22e75

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[saurabhbakolia]

@prakrutipathak resolve conflicts.

[prakrutipathak]

@saurabhbakolia Done can you check it?