Updated the "Check for Updates" functionality to rely solely on the latest published release in the upstream repository. Removed redundant code for fetching tags and commits, enhancing maintainability and reducing complexity.
This commit introduces a new "Service Information" section displaying runtime details, installed version, and update status for the NexaPG application. It includes backend API endpoints, database schema changes, and a corresponding frontend page that allows users to check for updates against the official repository. The `.env` example now includes an `APP_VERSION` variable, and related documentation has been updated.
