feat: wire Inbound API Route.To().Call() to site instance scripts and add Roslyn compilation

Completes the Inbound API → site script call chain by adding RouteToCallRequest
handlers in SiteCommunicationActor and DeploymentManagerActor. Also replaces the
placeholder dispatch table in InboundScriptExecutor with Roslyn compilation of
API method scripts at startup, enabling user-defined inbound API methods to call
instance scripts across the cluster.

src/ScadaLink.Host/Program.cs

@@ -129,6 +129,19 @@ try
         app.MapStaticAssets();
         app.MapCentralUI<ScadaLink.Host.Components.App>();
         app.MapInboundAPI();
+
+        // Compile and register all Inbound API method scripts at startup
+        using (var scope = app.Services.CreateScope())
+        {
+            var apiRepo = scope.ServiceProvider.GetRequiredService<ScadaLink.Commons.Interfaces.Repositories.IInboundApiRepository>();
+            var executor = app.Services.GetRequiredService<ScadaLink.InboundAPI.InboundScriptExecutor>();
+            var methods = await apiRepo.GetAllApiMethodsAsync();
+            foreach (var method in methods)
+            {
+                executor.CompileAndRegister(method);
+            }
+        }
+
         await app.RunAsync();
     }
     else if (nodeRole.Equals("Site", StringComparison.OrdinalIgnoreCase))