fix(maps): avoid 404 on keyless Google tiles-token probe (#1066)

Return an uncached unavailable-token response for keyless Google tile-token requests.

Contribution by @dvilrgamerz.

docs/CURRENT-STATE.md

@@ -1853,6 +1853,12 @@ supported. `.env.example` and `pinokio/_ENVIRONMENT` document both entries.
 The Street View headings tool uses the same server-first selection after
 resolving environment overrides per variable; its explicit `--key` wins.
 
+In standalone development and preview servers, a missing Google tile-token
+provider returns an uncached `204 No Content` for `GET /api/google/tiles-token`
+(and HEAD) instead of a browser-visible 404. The fallback is registered after
+real token providers and before the unknown-API handler, so existing Google
+browser keys, provider-issued tokens, and unrelated API routes remain unchanged.
+
 ## Infrastructure marker visibility
 
 Datacenter/dam registration uses fresh reusable factories with the application's