feat(bikeshare): add Oslo, Bergen and Trondheim Bysykkel

Add Norway's three Urban Sharing city-bike systems to the Bike Share
layer and get_bike_share. The feeds are keyless GBFS on
gbfs.urbansharing.com, which joins the proxy allowlist. The proxy now
sends the Client-Identifier header the operators ask clients to send.
Attributed under NLOD 2.0 in DATA_SOURCES.md and the data credits.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

src/data/dataCredits.js

@@ -251,6 +251,13 @@ export const DATA_CREDITS = [
     key: 'gbfs',
     html: 'Bikeshare availability: GBFS operator feeds (e.g. Austin BCycle)',
   },
+  {
+    key: 'urbansharing-gbfs',
+    html:
+      'City bikes (Norway): contains data under the ' +
+      '<a href="https://data.norge.no/nlod/en/2.0" target="_blank" rel="noopener">Norwegian licence for Open Government data (NLOD)</a> ' +
+      'made available by Oslo Bysykkel, Bergen Bysykkel and Trondheim Bysykkel',
+  },
   {
     key: 'osrm-routing',
     // The service asks for its attribution to carry a "fix the map" link, so

src/data/gbfsProxy.test.mjs

@@ -1,6 +1,7 @@
 import { test } from 'node:test';
 import assert from 'node:assert/strict';
 import {
+  GBFS_CLIENT_IDENTIFIER,
   GBFS_MAX_BODY_BYTES,
   fetchGbfsUpstream,
 } from '../../server/providers/gbfs.js';
@@ -56,6 +57,21 @@ test('GBFS upstream fetch passes a direct 200 through unchanged', async () => {
   });
 });
 
+test('GBFS upstream fetch names the app in the Client-Identifier header', async () => {
+  let observedHeaders = null;
+  await fetchGbfsUpstream(
+    'https://gbfs.urbansharing.com/oslobysykkel.no/station_status.json',
+    {
+      fetchImpl: async (_url, options) => {
+        observedHeaders = options.headers;
+        return new Response(STATION_BODY, { status: 200 });
+      },
+    },
+  );
+  assert.equal(GBFS_CLIENT_IDENTIFIER, 'gods-eye-view');
+  assert.equal(observedHeaders['Client-Identifier'], GBFS_CLIENT_IDENTIFIER);
+});
+
 test('GBFS upstream fetch forwards a non-redirect error status for the middleware to relay', async () => {
   const result = await fetchGbfsUpstream(STATION_URL, {
     fetchImpl: async () => new Response(null, { status: 404 }),

src/data/gbfsSource.js

@@ -8,6 +8,7 @@ const GBFS_ALLOWED_HOSTS = new Set([
   'austin.publicbikesystem.net',
   'hon.publicbikesystem.net',
   'chat.publicbikesystem.net',
+  'gbfs.urbansharing.com',
 ]);
 
 /**