Add nullable lat/lon (EPSG:4326, 6 dp) to /analyze competitors[] and
pipeline_24mo.top_objects[] so the frontend can plot Leaflet markers. Coords
come from domrf_kn_objects.latitude/longitude (same source as distance_m).
Purely additive: no existing field/shape changed. Frontend map layers follow
in a separate PR. Part of EPIC #958 (958-B4).