8647f5614c
- Implement DependencyContainer for all repositories and use cases - Create singleton pattern for repository instances - Factory methods for all use cases (auth + workspace) - Auth middleware: get_current_user with JWT verification - Permission middleware: require_workspace_access/admin/owner - Support optional authentication (get_current_user_optional) - Integrate with PermissionChecker and QuotaChecker Phase 4 Task 25/68 completed