Warnings
Google OAuth client ID fallbacks
auth_service.dart embeds placeholder OAuth client ID strings when EnvConfig is null.
Severity: medium Verified from source
What can go wrong
Google Sign-In fails on device without real client IDs.
Safe next action
Supply GOOGLE_OAUTH_CLIENT_ID_IOS / GOOGLE_OAUTH_SERVER_CLIENT_ID_ANDROID
via env; remove need for fallbacks when ready.