Add Windows Service support to enable service deployment

- Add Microsoft.Extensions.Hosting.WindowsServices package (v8.0.1)
- Configure host to use Windows Service lifetime management
- Enables proper startup/shutdown when installed via Deploy-PepApi.ps1

Fixes issue where service would fail to start when deployed as Windows Service.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

PepApi.Core/PepApi.Core.csproj

@@ -8,6 +8,7 @@
 
   <ItemGroup>
     <PackageReference Include="Microsoft.AspNetCore.OpenApi" Version="8.0.20" />
+    <PackageReference Include="Microsoft.Extensions.Hosting.WindowsServices" Version="8.0.1" />
     <PackageReference Include="Swashbuckle.AspNetCore" Version="6.6.2" />
   </ItemGroup>
 

PepApi.Core/Program.cs

@@ -4,6 +4,9 @@ using PepLib.Data;
 
 var builder = WebApplication.CreateBuilder(args);
 
+// Enable Windows Service hosting
+builder.Host.UseWindowsService();
+
 // Add services to the container
 builder.Services.AddControllers()
     .AddJsonOptions(options =>