docs: explain application log level and component filters #32

Silo-Server/silo-server#1568 adds a Level filter to Admin > Logs > Application and component suggestions while keeping the component field editable. Update src/content/docs/docs/running-a-server/logging.md (/docs/logging) after that PR merges.

In View logs, describe:

• Level offers debug, info, warn, and error; All levels clears the filter.
• Component suggests known values and accepts exact names such as apiv2 or notifications.fanout. Clear the field to show all components.
• Both filters apply to live logs and Browse log history, and remain in the URL for sharing or reloading.

Keep the distinction between viewing debug entries and the opslog.capture_level collection threshold. This changes the web admin controls; it needs no Apple, Android, or Jellyfin client documentation changes.

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