content: wire Serilog into SVSim.ContentServer

Calls UseSvSimSerilog("svsim-content") right after CreateBuilder and
wraps Main in try/catch/finally. No environment gate needed —
ContentServer has no test-suite path. The existing manual request-log
middleware (uses ILogger<Program>) now flows through Serilog
automatically; swapping it for UseSerilogRequestLogging() is a
follow-up per the spec.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

SVSim.ContentServer/Program.cs

@@ -1,4 +1,6 @@
 using Microsoft.Extensions.FileProviders;
+using Serilog;
+using SVSim.Hosting;
 
 namespace SVSim.ContentServer;
 
@@ -21,7 +23,10 @@ public class Program
     public static void Main(string[] args)
     {
         var builder = WebApplication.CreateBuilder(args);
+        builder.Host.UseSvSimSerilog("svsim-content");
 
+        try
+        {
         // Env var takes priority — it's the canonical knob per the spec docs.
         var contentRoot = Environment.GetEnvironmentVariable("SVSIM_CONTENT_ROOT")
             ?? builder.Configuration["Content:Root"];
@@ -83,5 +88,15 @@ public class Program
                               "content-addressed under /dl/Resource/ and /dl/Sound/.");
 
         app.Run();
+        }
+        catch (Exception ex)
+        {
+            Log.Fatal(ex, "Host terminated unexpectedly");
+            throw;
+        }
+        finally
+        {
+            Log.CloseAndFlush();
+        }
     }
 }

SVSim.ContentServer/SVSim.ContentServer.csproj

@@ -8,4 +8,8 @@
     <RootNamespace>SVSim.ContentServer</RootNamespace>
   </PropertyGroup>
 
+  <ItemGroup>
+    <ProjectReference Include="..\SVSim.Hosting\SVSim.Hosting.csproj" />
+  </ItemGroup>
+
 </Project>

SVSim.ContentServer/appsettings.json

@@ -5,6 +5,14 @@
       "Microsoft.AspNetCore": "Warning"
     }
   },
+  "Serilog": {
+    "MinimumLevel": {
+      "Default": "Information",
+      "Override": {
+        "Microsoft.AspNetCore": "Warning"
+      }
+    }
+  },
   "AllowedHosts": "*",
   "Content": {
     "Root": ""