Add scoped ReCClient and update project dependencies

Added `services.AddScoped<ReCClient>()` to both `AddRecClient`
method overloads in `DependencyInjection.cs` to ensure proper
scoped registration of `ReCClient`.

Updated `ReC.Client.csproj` to include necessary package
references for dependency injection and HTTP client support:
- `Microsoft.Extensions.DependencyInjection` (v10.0.0)
- `Microsoft.Extensions.Http` (v8.0.0)
- `System.Net.Http` (v4.3.4)

src/ReC.Client/DependencyInjection.cs

@@ -19,6 +19,7 @@ namespace ReC.Client
         /// <returns>An <see cref="IHttpClientBuilder"/> that can be used to configure the client.</returns>
         public static IHttpClientBuilder AddRecClient(this IServiceCollection services, string apiUri)
         {
+            services.AddScoped<ReCClient>();
             return services.AddHttpClient(ReCClient.ClientName, client =>
             {
                 client.BaseAddress = new Uri(apiUri);
@@ -33,6 +34,7 @@ namespace ReC.Client
         /// <returns>An <see cref="IHttpClientBuilder"/> that can be used to configure the client.</returns>
         public static IHttpClientBuilder AddRecClient(this IServiceCollection services, Action<HttpClient> configureClient)
         {
+            services.AddScoped<ReCClient>();
             return services.AddHttpClient(ReCClient.ClientName, configureClient);
         }
     }

src/ReC.Client/ReC.Client.csproj

@@ -11,6 +11,7 @@
 	</PropertyGroup>
 
 	<ItemGroup>
+	  <PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="10.0.0" />
 	  <PackageReference Include="Microsoft.Extensions.Http" Version="8.0.0" />
 	  <PackageReference Include="System.Net.Http" Version="4.3.4" />
 	</ItemGroup>