GBP List Photos

Lists the PHOTOS already on a Business Profile — each one's category, Google URL, thumbnail and id — and can delete one.

Uploading photos was possible, seeing them was not, so `gbp_upload_photo` had to be run blind: whether the profile already has a cover or a logo, whether the picture you just uploaded actually appeared, and whether you are about to upload the same photo twice were all unanswerable. Photos are grouped by `by_category` so the gaps are visible at a glance (a listing with no COVER and no LOGO ranks and converts worse than one that has them).

`by_category` and `missing_key_categories` are always counted over the WHOLE gallery; every matching photo is retained, with `limit` applying only to one transport response and `page_token=next_page_token` retrieving the cached continuation without another Google request or credit. `category` filters to one kind: COVER | PROFILE | LOGO | EXTERIOR | INTERIOR | PRODUCT | AT_WORK | FOOD_AND_DRINK | MENU | TEAMS | ADDITIONAL. `delete_photo` takes an id or full name from this list and removes it (confirm=true required) — deletion cannot be undone. location = a gbp_list_locations value or the business name/domain (auto-matched).