Restore a Service Fabric example (deleted in cae30c6)

Start with git show cae30c6^:src/ServiceFabricDemo/... and review the deleted projects, then check README.md and the Autofac Service Fabric documentation reference. Rebuild the sample with the listed Autofac.ServiceFabric registrations, dependency lifetime and configuration scenarios, update the dangling references, and validate it in a supported Windows, Ubuntu, or Azure Service Fabric environment rather than only compiling it.

The Service Fabric sample no longer exists in this repo, and both the Autofac docs and this repo's README still refer to it.

What happened

src/ServiceFabricDemo/ was deleted in cae30c6 ("Convert from AppVeyor to GitHub Actions CI"), which also replaced Examples.sln with Examples.slnx. The sample was an old-style .NET Framework app — packages.config, app.config, a .sfproj — so it presumably didn't survive the modernization, but the removal left two dangling references behind.

It contained these projects, and is recoverable from history as a starting point (git show cae30c6^:src/ServiceFabricDemo/...):

• AutofacServiceFabricDemo — the .sfproj application package
• DemoStatelessService
• DemoStatefulService
• DemoActor and DemoActor.Interfaces
• DemoShared — ILogger / Logger / LoggerModule

Dangling references to clean up

• README.md line 17 still says the Examples.sln file has every sample "except the ServiceFabric example. ServiceFabric is in a child directory and has its own solution." Both halves are now wrong: the file is Examples.slnx, and there is no ServiceFabric directory.
• The Autofac documentation linked to autofac/Examples/tree/master/src/ServiceFabricDemo from its Service Fabric integration page. That link was dead twice over — deleted directory, and master renamed to main — so the Example section has been removed from the docs page in autofac/Documentation#188. It should be restored, pointing here, once a sample exists again.

What a replacement should cover

This is also the follow-up for Autofac.ServiceFabric#26, which asked for the sample to be brought up to date and is being closed in favor of this issue. A rebuilt sample would ideally show:

• RegisterServiceFabricSupport plus RegisterStatelessService / RegisterStatefulService / RegisterActor
• A dependency that consumes ServiceContext, registered InstancePerMatchingLifetimeScope("ServiceFabric") — the SingleInstance pitfall is a recurring support question
• The configurationAction hook, ideally with the Application Insights FabricTelemetryInitializer scenario
• Current SF package versions, all aligned, on a modern SDK-style project

Note on effort

Worth being honest that this is not a small task and is the most expensive item in the current Service Fabric cleanup. Building and validating it needs a real Service Fabric cluster: there's no native macOS runtime, and while a Linux onebox Docker image exists, the docs around it are stale. A Windows or Ubuntu environment, or an Azure cluster, is realistically required to verify the sample actually runs rather than merely compiles.

Help here would be genuinely welcome from anyone actively working with Service Fabric.