feat(auth): implement password reset and email verification

[TanvirTian]

Description

Implemented a robust password reset workflow and email verification system for new users. Users can now request a password reset link, reset their password securely, and verify their email addresses during registration.

This improves security and ensures that only verified users can access the system.

Type of Change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Code refactoring (no functional changes)
• Performance improvement
• Test updates

Related Issues

• Closes [Dev-backend] -> Implement Email Verification System #71

Changes Made

• Added is_verified flag to the User model.
• Implemented forgotPassword and resetPassword services in auth_service.
• Added email verification workflow with token generation and validation.
• Updated RegisterForm and backend registration to send verification emails.

Testing Checklist

• Unit tests added or updated
• Integration tests pass
• Manual testing completed
• Documentation updated (if applicable)
• All existing tests pass

Screensh

Code Quality Checklist

• My code follows the project's style guidelines
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have updated the documentation to reflect my changes
• My changes generate no new warnings or errors
• 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

Additional Context

N/A