Relocates ModuleOrchestrator, ServiceCollectionExtensions, and
ApiPrefixConvention from SlpModularCms.Api into SlpModularCms.Core.Hosting
so a new Master-less SlpModularCms.Api.Slave host project (ports 5285/7222)
can share the same bootstrap code without duplicating it. This lets a
developer run a master instance and a slave instance side by side locally
to test the master/slave connection, without touching the existing
master/slave protocol itself.
Relocates the two orchestrator/convention test files from
Modules.Identity.Tests to Core.Tests, dropping an incidental
ProjectReference to SlpModularCms.Api that existed only for those tests.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
