Add OSM service, map click handler

app/services/osm.js

@@ -0,0 +1,25 @@
+import Service from '@ember/service';
+
+export default class OsmService extends Service {
+  async getNearbyPois(lat, lon, radius = 200) {
+    const query = `
+[out:json][timeout:25];
+(
+  nwr["amenity"](around:${radius},${lat},${lon});
+  nwr["shop"](around:${radius},${lat},${lon});
+  nwr["tourism"](around:${radius},${lat},${lon});
+  nwr["leisure"](around:${radius},${lat},${lon});
+  nwr["historic"](around:${radius},${lat},${lon});
+);
+out center;
+    `.trim();
+
+    const url = `https://overpass-api.de/api/interpreter?data=${encodeURIComponent(
+      query
+    )}`;
+    const res = await fetch(url);
+    if (!res.ok) throw new Error('Overpass request failed');
+    const data = await res.json();
+    return data.elements;
+  }
+}