Introduced a new handleDBError utility in modules/utils.js to centralize database error logging and throwing. Refactored all repositories to use this utility, replacing repetitive error handling and logger calls with a single function call for improved maintainability and consistency.
Introduces Discord OAuth2 integration for account association and login, including new routes for linking, unlinking, and authenticating via Discord. Adds supporting services, repositories, and schema validation for the OAuth2 flow. Refactors database schema and queries for consistency, and updates dependencies to include required OAuth2 libraries.
