BREAKING CHANGES:
- Removed Workspace, WorkspaceMember, WorkspaceInvitation entities
- Project now has owner_user_id instead of workspace_id
- Added shared_users list to Project for collaboration
- Subscription/quota moved from Workspace to User level
Changes:
- packages/domain/entities.py: Removed Workspace entities, updated Project
- packages/adapters/sqlalchemy_impl/models.py: Updated models
- packages/application/: Removed workspace use cases, updated other use cases
- packages/ports/: Removed workspace repository interfaces
- apps/api/: Updated routes, schemas, dependencies, router
- alembic/versions/007_remove_workspace_concept.py: Database migration
New APIs:
- POST /projects/{id}/share: Share project with user
- DELETE /projects/{id}/share/{user_id}: Unshare project
- Implement CreateWorkspaceUseCase with subscription plan support
- Auto-configure quotas based on plan (free/pro/enterprise)
- Auto-create owner membership record on workspace creation
- Validate workspace name (required, max 100 chars)
- Validate owner user exists before creation
- Add 7 comprehensive unit tests (all passed)
Phase 4 Task 12/68 completed