Todolist API

API for managing Todo items, including CRUD operations, subtasks, deadlines, attachments (stored in GCS), and user-defined Tags. Supports user authentication via email/password (JWT) and Google OAuth. Designed for use with oapi-codegen and Chi.

Note on Notifications: Real-time notifications (e.g., via SSE or WebSockets) are planned but not fully described in this OpenAPI specification due to limitations in representing asynchronous APIs. These will be documented separately.

Note on Tag Deletion: Deleting a Tag will typically remove its association from any Todo items currently using it.