The mobile app needs an "All" tile to browse every product regardless of
category. Rather than inserting a real app_category row (which would break
once any category-scoped product filter treats it as an actual, empty
category), the service now prepends a synthetic entry with categoryid=0 —
reusing the "0 = no category filter" convention GetAllProducts already
implements in FetchFilteredProducts.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
