Drop the duplicated `id` alias from JWT payloads and related token generation across auth providers and endpoints. The TokenPayload interface no longer includes `id`; middleware now derives `user.id` from `sub` when attaching the authenticated user to requests. Update tests accordingly. This reduces redundancy and ensures the canonical user identifier is `sub`.
Introduce a shared useApiTokens hook to centralize API token CRUD and UI state (fetch, create, delete, copy, formatting). Refactor ApiTab and ApiTokensSection to consume the hook and remove duplicated logic. Add getInstanceUrl utility for client origin used in curl examples. Include an id alias in TokenPayload and add id into generated JWTs across auth routes and providers; update tests accordingly. Improve auth middleware typing and add debug logging around lastUsedAt updates. Add admin logging when creating a token with a role that differs from the target user's role.
Introduced a Vitest-based backend unit testing framework with supporting scripts, helpers, and GitHub Actions integration. Refactored the admin settings page to a modular architecture, splitting monolithic logic into feature-specific tabs and hooks for improved maintainability and testability. Updated documentation to reflect the new testing setup and settings architecture, and added new dependencies for testing utilities.