fix(sip): preserve Record-Route in INVITE 2xx#170
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Fixes live Chime ACK loss by preserving every INVITE Record-Route header exactly and in order in dialog-establishing 2xx responses, as required by RFC 3261. The production-shaped E2E caller now derives ACK and BYE routing from the actual response instead of sending directly to Rustisk. Adds double-route, public Contact, proxy-next-hop, and no-route-negative coverage. Validation: 829 SIP tests, 221 integration tests, and full trunk E2E pass.