Fix 404 on HEAD for the FW Lite App Installer manifest

[hahn-kev-bot]

when windows tries to autoupdate from an AppInstaller it calls HEAD on the url, this currently fails with a 404. This fixes that.

AI summary

Windows App Installer sends a HEAD request to the .appinstaller manifest URL and requires a Content-Length header. ASP.NET Core routing does not match HEAD against an [HttpGet]-only action, so the router returned 405.

This adds [HttpHead] on the same AppInstaller action. No separate handler: File() already sets Content-Length and Content-Type and omits the body for HEAD. Other fwlite-release endpoints are JSON or redirects and are not probed by App Installer.

Test plan

• AppInstallerActionAcceptsHeadOnTheSamePathAsGet passes
• curl -I https://<host>/api/fwlite-release/FieldWorksLite.appinstaller returns 200 with Content-Length and Content-Type: application/appinstaller
• GET of the same URL still returns the XML body

Made with Cursor

[coderabbitai]

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