Improve transparency of “Use new service names” setting

The global setting “Use new service names” currently lacks transparency and makes it difficult to understand its impact.
For each listed check plugin, it is not visible:

- what the old service name was
- what the new service name will be
- whether there is a related Werk or documented change

This makes it hard to assess the impact before enabling the option, especially in environments with:

- existing rules based on service descriptions
- integrations with external systems
- reliance on historical data

Suggested improvement:

- Show old → new service name mapping per plugin
- Provide a reference to the related Werk / documentation
- Optionally include a short preview/example

This would greatly improve usability and reduce the risk of unintended side effects.

regards
Christian