## Context
Self-hosted enterprise pricing is documented as per user ("Pricing is
per user and each user needs a licence"), but seat counts reported to
the enterprise API counted active `userWorkspace` rows. A user belonging
to two workspaces on the same instance was billed as two seats.
## What this does
- Adds `EnterprisePlanService.getBillableSeatCount()`, which counts
`DISTINCT userId` over non-deleted userWorkspaces, keeping the existing
floor of 1.
- Uses it at all four seat-reporting sites: the checkout session
quantity, the seat reports on key activation (`setEnterpriseKey`) and
server-binding release, and the recurring validation cron report.
- Removes the two duplicated private `getActiveUserWorkspaceCount()`
counters and their `UserWorkspaceEntity` repository injections from the
resolver and cron job.
- Adds unit tests for the new method (dedup across workspaces, floor of
1, missing row).
## Intentionally unchanged
- The website `/api/enterprise/seats` and `/checkout` routes apply
whatever quantity the instance reports, so no Stripe-side change is
needed.
- Instance telemetry still reports both `activeUserWorkspaceCount` and
`distinctUserCount`, so the delta stays observable.
- Existing subscriptions need no migration: the next cron seat report
prorates affected instances down automatically.
## Test
- `enterprise-plan.service.spec.ts`: 58 passed (3 new)
- `lint:diff-with-main` and `typecheck` for twenty-server pass
---
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Félix Malfait
aafee63706
