fleet-server action/apikey improvements

Performance improvements to handling `internal/pkg/action` and `internal/pkg/apikey`

Start by reviewing internal/pkg/action and internal/pkg/apikey to understand how these areas handle requests and identify a measurable performance baseline. The issue does not name a bottleneck, benchmark, test, or acceptance criterion, so confirm the target and how improvement will be evaluated before making changes.

Written by the indexing model from the issue text.