- Remove workspace_id from Pydantic models in project_management routes
- Remove workspace_id from SQLAlchemy and SQLite project management repos
- Remove workspace_id from worker tasks (storage keys, entity creation)
- Remove workspace_id from video dedup and title usage modules
- Remove workspace_id from generation and ingest worker tasks
- Clean workspace_id from all test files and scripts
- Remove workspace-specific test files (list_workspaces, workspace repos)
Task: #14 workspace_id 残留清理
- Implement AcceptInvitationUseCase with validation
- Check invitation status, expiration, and email match
- Auto-create WorkspaceMember on accept
- Handle case when user is already a member
- Implement DeclineInvitationUseCase to reject invitations
- Update invitation status (accepted/declined/expired)
- Add 9 comprehensive unit tests (all passed)
Phase 4 Task 14/68 completed
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