Prefer FCM_SERVICE_ACCOUNT_FILE/JSON over legacy FCM_SERVER_KEY,
mount secrets/ into core-backend, and document Master JSON placement.
Co-authored-by: okuma <o0kuma@users.noreply.github.com>
Ports the Python prototype (backend/) to the actual chosen stack --
Gin + gorilla/websocket + GORM, same DB schema (models.go mirrors
backend/app/models.py), same endpoints (signup, message send,
WebSocket relay). backend/ stays as a reference prototype, not
removed.
Verified with go test: signup, duplicate-invite-code rejection (409),
404 on an unknown conversation, and WebSocket broadcast delivery all
pass -- the same cases the Python version was checked against.
Push notifications, AI service integration, and multi-device sync
are not in this commit -- see core-backend/README.md.
Cursor Agent
Claude