Search Wolt restaurants and stores near a coordinate

Returns restaurants and stores near a coordinate, optionally filtered by a keyword or browsed by category. With none of those, this reads Wolt's own plain location browse; with a query it uses Wolt's own keyword search across restaurant/store names, dishes, and cuisines; with a category it browses Wolt's own per-category listing (the same page a homepage cuisine tile links to) -- call /wolt/search/filters for the current, complete, location-scoped list of valid category values. category and query cannot be combined. A keyword search additionally accepts sort, product_line, and open_now; those three apply to keyword search only and return a 400 without query. Each result carries its slug (the value the restaurant and menu endpoints take), name, address, coordinates, tags, price range, rating, and delivery estimate; the two browse modes additionally carry each venue's own category ids. The response also carries is_serviceable, which says whether Wolt delivers to the requested coordinates at all: false means the coordinates are outside Wolt's delivery coverage, so the empty results list is a coverage answer rather than a no-matches answer. A keyword that simply matches nothing inside a covered area returns an empty list with is_serviceable true. Call /wolt/cities for the coordinates of every city Wolt operates in.