Remove private names from documentation examples

[alexanderkreidich]

Problem

The public documentation uses the private/domain-specific name spid.center as a custom-glossary example, including:

• README.md: "spid dot center" → spid.center
• README.ru.md: «спид точка центер» → spid.center
• server/glossary.example.json

Documentation and example configuration should use neutral, fictional terms instead of private names.

Acceptance criteria

• Replace spid.center and its spoken variants in all documentation and example files with a neutral fictional example.
• Keep the example useful for demonstrating decoder bias and regex cleanup.
• Verify that no references to the private name remain in tracked documentation or sample configuration files.