Introduces endpoints for QR code-based login and user management in the stream-gears server. Adds support for creating, deleting, and listing users, as well as endpoints for QR code generation and login via QR code. Refactors configuration management to use a global LazyLock, updates model serialization for streamer hooks, and improves context and service registration to support stateless clients. Also updates the frontend to handle new user and QR code flows, and adds an image resource for donation display in the README.