Geocoding learns categories

A /geocode/nearby endpoint with a category filter and distance sort, backed by an 89-category taxonomy with English and French aliases, so ?category=boulangerie works from raw curl. The rebuilt corpus that carries the category column went live on 2026-09-03.

• 89 category ids with bilingual, accent-insensitive aliases, resolved at the gateway
• nearby() in @unmap/geocoding alongside search, autocomplete and reverse