List Japan Rail Station Nearby

Return JapanPlace rows within radius_m of the named station.

Uses ST_DWithin(geography) so the radius is a true great-circle distance, not a degree approximation. Both columns (the station's geom and japan_places.geom) are GiST-indexed; the predicate pushes through to the index when wrapped in ::geography.

Returns: { "station": { id, station_name_ja, station_name_en, line_ids, lat, lng }, "places": [ { id, name, en_name, rank, type, prefecture, lat, lng, tagline, photo_url, distance_m } ] }

Photo URL is the first japan_place_photos.url if present (matches the existing /api/japan listing's serialization). distance_m is the great-circle distance in meters, rounded to the nearest meter.