Feat: Implement JWT and bcrypt security

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Create the necessary middleware to manage user authentication and enhance application security.

### Task to complete
- Implement JWT generation and verification.
- Set up bcrypt for password hashing.
- Develop middleware to project private routes.
- Ensure passwords are securely stored in the database.

### Acceptance criteria
- Users must be able to log in securely.
- JWT tokens should expire as per the configured settings.
- Passwords stored in the database must be irrecoverable.