Boots a real StandardServer + OpcUaApplicationHost, wires
SdkServiceLevelPublisher into a DeferredServiceLevelPublisher (production
binding pattern), spawns OpcUaPublishActor against the deferred
publisher, sends RedundancyStateChanged snapshots, and asserts that
ServerObject.ServiceLevel.Value reflects the role-derived byte:
Primary + RoleLeaderForDriver → 240
Secondary → 100
Together with the F13b endpoint-security tests (which already verify
ServerConfiguration.SecurityPolicies populates the three baseline
profiles), this closes Task 60's "dual-endpoint + ServiceLevel" scope.
Cross-node failover tests stay in the 2-node integration harness
(Task 59 / FailoverScenarioTests).
Runtime suite now 74 / 74 green (+2). Closes Task 60.
