- 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 InviteMemberUseCase with role-based permission check
- Only owner/admin can invite members (not regular members)
- Cannot invite as owner (owner is unique per workspace)
- Check for duplicate invitations and existing members
- Generate invitation token with 7-day expiration
- Send invitation email with accept link
- Add 7 comprehensive unit tests (all passed)
Phase 4 Task 13/68 completed
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