Introduces new session server endpoints for hasJoined and profile lookup, adds a SessionError class for improved error handling, and updates error exports. Also renames sessionRepository and sessionService files to sessionsRepository and sessionsService for consistency, and sets max listeners in logger.
Add environment example, update .gitignore, and switch license to AGPL v3. Introduce error handling classes, ESLint config, and main modules for database, logging, certificate management, and utility functions. Add authentication routes, schemas, and service layer for a modular REST API. Update README and set up repository structure for further development.
