feat: v0.1.1 — TMF638/639/641 mock server

- Domain-aware seed data (DSLAM, OLT, ONT, BTS, DSL ports)
- Cross-API referential integrity enforcement (TMF638/639/641)
- Lifecycle state machine from TMForum v4.0.0 spec
- 70 passing tests
- conformance.md with CTK links and gap analysis