feat(auth): implement JWT authentication and user registration

- Added JWT authentication with token generation and validation.
- Introduced user registration functionality with email and password.
- Integrated Argon2 for password hashing.
- Created SQLite user repository for user data persistence.
- Updated application context to include user repository and configuration settings.
- Added environment variable support for JWT secret and registration allowance.
- Enhanced error handling for unauthorized access and validation errors.
- Updated presentation layer to handle login and registration requests.

.env.example

@@ -0,0 +1,5 @@
+DATABASE_URL=sqlite:./dev.db
+PORT=3000
+JWT_SECRET=
+JWT_TTL_SECONDS=
+ALLOW_REGISTRATION=true