Add microservices scaffold

DorkNet.Contracts/DorkNet.Contracts.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net9.0</TargetFramework>
+    <Nullable>enable</Nullable>
+    <ImplicitUsings>enable</ImplicitUsings>
+  </PropertyGroup>
+
+</Project>

DorkNet.Contracts/DorkNetServiceMapOptions.cs

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+namespace DorkNet.Contracts;
+
+public sealed class DorkNetServiceMapOptions
+{
+    public string Identity { get; set; } = "http://localhost:8081";
+    public string Rooms { get; set; } = "http://localhost:8082";
+    public string Notify { get; set; } = "http://localhost:8083";
+    public string Monolith { get; set; } = "http://localhost:8084";
+
+    public IReadOnlyList<DorkNetServiceEndpoint> Endpoints()
+    {
+        DorkNetServiceEndpoint[] endpoints =
+        [
+            new(ServiceNames.Identity, Identity),
+            new(ServiceNames.Rooms, Rooms),
+            new(ServiceNames.Notify, Notify),
+            new(ServiceNames.Monolith, Monolith),
+        ];
+
+        return endpoints
+            .Where(endpoint => !string.IsNullOrWhiteSpace(endpoint.BaseUrl))
+            .ToArray();
+    }
+}
+
+public sealed record DorkNetServiceEndpoint(string Name, string BaseUrl);

DorkNet.Contracts/ServiceContracts.cs

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+namespace DorkNet.Contracts;
+
+public sealed record ServiceHealthResponse(
+    string Service,
+    string Status,
+    DateTimeOffset CheckedAtUtc);
+
+public sealed record ServiceCapabilityResponse(
+    string Service,
+    string[] Owns,
+    string[] PlannedPublicRoutes);
+
+public sealed record ServiceProbeResponse(
+    string Service,
+    string BaseUrl,
+    string Status,
+    int? StatusCode,
+    string? Error,
+    DateTimeOffset CheckedAtUtc);

DorkNet.Contracts/ServiceNames.cs

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+namespace DorkNet.Contracts;
+
+public static class ServiceNames
+{
+    public const string Gateway = "gateway";
+    public const string Identity = "identity";
+    public const string Rooms = "rooms";
+    public const string Notify = "notify";
+    public const string Monolith = "monolith";
+}