Add microservices scaffold

DorkNet.ServiceDefaults/DorkNet.ServiceDefaults.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net9.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <FrameworkReference Include="Microsoft.AspNetCore.App" />
+    <ProjectReference Include="..\DorkNet.Contracts\DorkNet.Contracts.csproj" />
+  </ItemGroup>
+
+</Project>

DorkNet.ServiceDefaults/DorkNetServiceDefaultsExtensions.cs

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+using DorkNet.Contracts;
+using Microsoft.AspNetCore.Builder;
+using Microsoft.AspNetCore.Http;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Hosting;
+
+namespace DorkNet.ServiceDefaults;
+
+public static class DorkNetServiceDefaultsExtensions
+{
+    public static WebApplicationBuilder AddDorkNetServiceDefaults(
+        this WebApplicationBuilder builder,
+        string serviceName)
+    {
+        builder.Services.AddSingleton(new DorkNetServiceInfo(serviceName));
+        builder.Services.AddHealthChecks();
+        builder.Services.AddHttpClient();
+        builder.Services.ConfigureHttpJsonOptions(opt =>
+            opt.SerializerOptions.PropertyNamingPolicy = null);
+
+        return builder;
+    }
+
+    public static WebApplication MapDorkNetServiceDefaults(this WebApplication app)
+    {
+        app.MapHealthChecks("/healthz");
+        app.MapGet("/internal/healthz", (DorkNetServiceInfo info) =>
+        {
+            return Results.Ok(new ServiceHealthResponse(
+                info.Name,
+                "ok",
+                DateTimeOffset.UtcNow));
+        });
+
+        return app;
+    }
+}

DorkNet.ServiceDefaults/DorkNetServiceInfo.cs

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+namespace DorkNet.ServiceDefaults;
+
+public sealed record DorkNetServiceInfo(string Name);