202507 antex file discovery #191
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This PR implements the logic for discovering the most recent ANTEX file, either locally or from the ESA FTP server (
gssc.esa.int). Based on the GPS week extracted from a given RINEX observation file, the code checks whether a more recent ANTEX file is available remotely. If the local and remote files are the same, the local copy is used; otherwise, the latest remote file is preferred. A warning is logged if the most recent ANTEX file is older than the observation file. This discovery logic is isolated and designed to be easily testable, forming a clean foundation for future download and parsing operations.