Fix Invoke-FuzzyScoop for nested Scoop bucket manifests

[chengr025]

Invoke-FuzzyScoop currently enumerates only the direct children of each bucket's bucket directory. This works for traditional flat buckets, but it treats subdirectories as apps when a bucket organizes manifests in nested folders.

Scoop supports manifests in subfolders, and some buckets use this layout. For example, abgox/abyss stores manifests under paths such as:

bucket/a/abgox/abgox.scoop-i18n.json

Before this change, fs shows entries like:

abyss/a
abyss/z

and the preview runs scoop info abyss/a, which fails.

This change recursively enumerates only *.json files and uses the manifest BaseName as the app name. Flat buckets continue to work as before, while nested buckets are now supported.

[kelleyma49]

Merged. Thank you for your contribution!