feat(bikeshare): add Kolumbus, Farte and Lillestrøm city bikes

Cover every Norwegian station-based city-bike system with an open GBFS
feed: Kolumbus Bysykkel (Stavanger) and Farte Bysykkel (Skien/Porsgrunn)
through Entur Mobility, and Bysykkel Lillestrøm through JCDecaux
Cyclocity.

api.entur.io and api.cyclocity.fr join the GBFS allowlist, each kept to
its GBFS path prefix since both hosts front other APIs. Entur serves its
feeds without a .json suffix, so the endpoint checks accept either form,
and requests to Entur carry the ET-Client-Name header it requires.
Attributed under NLOD (Entur) and Licence Ouverte (JCDecaux).

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

CHANGELOG.md

@@ -3,10 +3,15 @@
 ## [Unreleased]
 
 - Add Norway's city bikes to the Bike Share layer: Oslo, Bergen and
-  Trondheim Bysykkel (Urban Sharing, ~440 stations). The feeds are keyless
-  GBFS on `gbfs.urbansharing.com`, which joins the proxy allowlist; the proxy
-  now sends the `Client-Identifier: gods-eye-view` header the operators ask
-  for. Attributed under NLOD 2.0. `get_bike_share` covers the three cities too.
+  Trondheim Bysykkel (Urban Sharing), Kolumbus Bysykkel in Stavanger and
+  Farte Bysykkel in Skien/Porsgrunn (Entur Mobility), and Bysykkel
+  Lillestrøm (JCDecaux), about 760 stations in all. Every feed is keyless
+  GBFS. `gbfs.urbansharing.com`, `api.entur.io` and `api.cyclocity.fr` join
+  the proxy allowlist; the last two are kept to their GBFS paths. The proxy
+  now sends `Client-Identifier: gods-eye-view` on every request and
+  `ET-Client-Name: gods-eye-view-bikeshare` to Entur, as the operators ask,
+  and accepts Entur's extensionless feed paths. Attributed under NLOD and
+  Licence Ouverte. `get_bike_share` covers the six systems too.
 
 - Add Norway's road cameras from Statens vegvesen as a CCTV pack. The camera
   list is one keyless GeoJSON request to the agency's OGC API view of its