Advertisement.species existed in the schema but was never wired up —
the admin form never let you set it and the feed's ad query ignored it
entirely, showing every active ad to every pet regardless of species.
Adds a new Advertisement.breeds field alongside it and wires both
through the whole path: a targeting UI in the ad create/edit dialog
(species checkboxes, each expandable into its own breed checklist),
and a filter in admin.getActiveAds (now scoped to the viewing pet) so
cat food ads stop reaching dog owners. Empty species/breeds = shown to
everyone, unchanged from today's behavior.
admin
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