feat(search): compose Google and Photon through an explicit provider service

src/standalone/placeSearch.js

@@ -0,0 +1,32 @@
+import {
+  createPlaceSearch,
+  createGoogleGeocoder,
+  createPhotonGeocoder,
+} from '../search/index.js';
+
+/** Google first when configured, then keyless Photon; transport stays local to setup. */
+export function createStandalonePlaceSearch({
+  resolveApiKey,
+  fetchImpl = (...args) => fetch(...args),
+  signal,
+} = {}) {
+  return createPlaceSearch({
+    signal,
+    providers: [
+      createGoogleGeocoder({
+        request(query, { bias, signal }) {
+          const key = resolveApiKey?.();
+          if (!key) return null;
+          const url = new URL(
+            'https://maps.googleapis.com/maps/api/geocode/json',
+          );
+          url.searchParams.set('address', query);
+          url.searchParams.set('key', key);
+          if (bias) url.searchParams.set('bounds', bias);
+          return fetchImpl(url.toString(), { signal });
+        },
+      }),
+      createPhotonGeocoder({ fetchImpl }),
+    ],
+  });
+}