preprod build-distribution/latest requires appId + platform query params

Trap: projects/<org>/<project>/preprodartifacts/build-distribution/latest/ looks like it should return the latest build without params. Fix: it requires ?appId=<bundle-id>&platform=apple|android — omitting either returns 400 {"appId":["This field is required."],"platform":["This field is required."]}. Platform accepts ONLY "apple" or "android" — Electron and other platforms are unsupported. Without a real appId that matches an uploaded build, latestArtifact will be null (valid 200, no error).