Implement official test form Bundesnetzagentur

Implement speed test based on the official Tool provided by the Bundesnetzagentur, that is also accepted by German Companies as a proof that the internet connection has been lost. See: https://breitbandmessung.de/

Research the Bundesnetzagentur's official speed test tool at breitbandmessung.de to understand its API or methodology. Look at existing network analysis scripts in the repository to see how speed tests are currently implemented. Determine how to integrate this official test, ensuring it meets the proof-of-loss requirements for German companies. Verify the implementation by comparing results with the official tool.

Written by the indexing model from the issue text.