{"message":"GeoJSON Data API Server","endpoints":{"health":"GET /health (?db=1 で DB 接続確認)","elevationTiles":"/elevationTiles","geojson":{"clipByPolygonWithTrim":"POST /geojson/clip-by-polygon-with-trim","clipByRect":"POST /geojson/clip-by-rect","clipByRectWithTrim":"POST /geojson/clip-by-rect-with-trim","pickByPoint":"POST /geojson/pick-by-point"}}}