feat: implement secure password hashing using werkzeug

[Swara888]

Replaced plain-text password storage with secure hashing using werkzeug.security.

Changes:

• Implemented generate_password_hash during student and teacher registration.
• Replaced direct SQL password matching with check_password_hash verification.
• Improved authentication security without altering database schema.
• Ensured backward compatibility with existing structure.

This enhances security by preventing sensitive password exposure in the database.

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