Feat: Build Auth module: JWT auth, refresh tokens, and password reset

[estyemma]

Closed: #354
Summary of Changes Made

1. Added PasswordResetToken entity to store password reset tokens in the database
2. Added DTOs ( PasswordResetRequestDto, PasswordResetConfirmDto ) for password reset functionality
3. Updated AuthModule to include the PasswordResetToken repository
4. Added sendPasswordResetEmail method in EmailService to send password reset emails
5. Added password reset methods in EnhancedAuthService :
   • requestPasswordReset: sends reset link to user's email
   • confirmPasswordReset: resets password and invalidates all user refresh tokens
6. Added logout method ( revokeRefreshToken ) in EnhancedAuthService to revoke a given refresh token
7. Added endpoints in EnhancedAuthController :
   • POST /api/auth/password-reset: request password reset
   • POST /api/auth/password-reset/confirm: confirm password reset
   • POST /api/auth/logout: logout by revoking refresh token
8. Updated .env.example to add PASSWORD_RESET_URL
   The authentication system now has full JWT auth with refresh tokens, password reset, and secure logout!