## Summary
- Limits workspace creation to 5 workspaces per server when no valid
enterprise key is configured
- Enterprise key validity is checked first (synchronous, in-memory
cached) to avoid unnecessary DB queries on enterprise deployments
- Adds 4 unit tests covering: limit enforcement, enterprise key bypass,
below-limit creation, and performance (no enterprise check when
workspace count is zero)
## Test plan
- [x] All 11 unit tests pass (8 existing + 3 new behavioral + 1
performance assertion)
- [ ] Manual: verify workspace creation blocked at limit=5 without
enterprise key
- [ ] Manual: verify workspace creation allowed beyond limit with valid
enterprise key
- [ ] Manual: verify first workspace (bootstrap) creation is unaffected
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