Fix backend API to return location_info instead of search_location

The frontend expects location_info with coordinates array, but backend was
returning search_location with lat/lng keys. This fix enables the map toggle
to appear for location-based searches.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

backend/app.py

@@ -350,7 +350,11 @@ async def get_schools(
         "page": page,
         "page_size": page_size,
         "total_pages": (total + page_size - 1) // page_size if page_size > 0 else 0,
-        "search_location": {"postcode": postcode, "radius": radius, "lat": search_coords[0], "lng": search_coords[1]}
+        "location_info": {
+            "postcode": postcode,
+            "radius": radius * 1.60934,  # Convert miles to km for frontend display
+            "coordinates": [search_coords[0], search_coords[1]]
+        }
         if search_coords
         else None,
     }