Add server configuration service and repo

RecNet.Domain/Entities/Configuration/ServerConfig.cs

@@ -0,0 +1,24 @@
+using RecNet.Domain.Exceptions;
+
+namespace RecNet.Domain.Entities.Configuration;
+
+public class ServerConfig
+{
+    private ServerConfig(string key, string value)
+    {
+        Key = RequireValue(key, nameof(key));
+        Value = value;
+    }
+
+    public string Key { get; private set; }
+    public string Value { get; private set; }
+
+    public static ServerConfig Create(string key, string value)
+        => new(key, value);
+
+    public void SetValue(string value)
+        => Value = value;
+
+    private static string RequireValue(string value, string parameterName)
+        => !string.IsNullOrWhiteSpace(value) ? value : throw new DomainException($"{parameterName} is required.");
+}

RecNet.Domain/RecNet.Domain.csproj

@@ -6,8 +6,4 @@
         <Nullable>enable</Nullable>
     </PropertyGroup>
 
-    <ItemGroup>
-      <Folder Include="Entities\" />
-    </ItemGroup>
-
 </Project>

RecNet.Domain/Repositories/IServerConfigRepository.cs

@@ -0,0 +1,10 @@
+using RecNet.Domain.Entities.Configuration;
+
+namespace RecNet.Domain.Repositories;
+
+public interface IServerConfigRepository
+{
+    Task<ServerConfig?> GetAsync(string key, CancellationToken ct = default);
+    Task SetAsync(string key, string value, CancellationToken ct = default);
+    Task SaveChangesAsync(CancellationToken ct = default);
+}