Implements spec 072 (workspace-first managed tenants enforcement) and follow-up RBAC fixes.
Highlights:
- Workspace-scoped managed tenants landing and enforcement for tenant routes.
- Workspace membership management UI fixed to use workspace capabilities.
- Membership tables now show user email + domain for clearer identification.
Tests:
- Targeted Pest tests for routing/enforcement and RBAC UI enforcement.
- Pint ran on dirty files.
Co-authored-by: Ahmed Darrazi <ahmeddarrazi@MacBookPro.fritz.box>
Reviewed-on: #87