This commit introduces a new endpoint, `GetSelfController`, for fetching authenticated user information in the `AuthController`. It also improves token handling by refactoring token retrieval from headers into a utility function. Additionally, the User service has been extended with new methods for getting a user by ID and for fetching follower and following information. Token UUID handling during registration has been tweaked for consistency. Improvements in logging levels and responses status codes have been made as well.