Adds a `macos_applications` boolean query parameter to the list host
software endpoint (`GET /api/_version_/fleet/hosts/{id}/software`). When
true, results are restricted to apps installed at the top level of the
macOS /Applications folder, hiding helper apps, system apps,
command-line tools, and user-local apps. The filter applies only to
macOS hosts and is ignored on other platforms.
The filter is applied by pruning the in-memory software maps in
ListHostSoftware down to the title IDs that have a top-level
`/Applications` bundle, so the count and paginated queries stay
consistent and the filter applies uniformly across regular, VPP, and
in-house apps. Top-level is determined from
`host_software_installed_paths` via
`installed_path LIKE '/Applications/%' AND NOT LIKE '/Applications/%/%'
on source 'apps'`.
**Related issue:** Resolves#39017
Dante Catalfamo
8cb7f8af67