Add Steam auth, platform validators & name gen

RecNet.Application/Common/Interfaces/IConfigService.cs

@@ -2,6 +2,7 @@ namespace RecNet.Application.Common.Interfaces;
 
 public interface IConfigService
 {
-    Task<T?> GetAsync<T>(string key, T? defaultValue = default, CancellationToken ct = default);
+    Task<T?> GetAsync<T>(string key, CancellationToken ct = default);
+    Task<T> GetAsync<T>(string key, T defaultValue, CancellationToken ct = default);
     Task SetAsync<T>(string key, T value, CancellationToken ct = default);
 }

RecNet.Application/Common/Interfaces/IPlatformAuthValidator.cs

@@ -0,0 +1,14 @@
+using RecNet.Application.Common.PlatformAuth;
+using RecNet.Domain.Common;
+
+namespace RecNet.Application.Common.Interfaces;
+
+public interface IPlatformAuthValidator
+{
+    PlatformType PlatformType { get; }
+
+    Task<PlatformAuthResult> ValidateAsync(
+        string platformAuthentication,
+        string platformId,
+        CancellationToken ct = default);
+}

RecNet.Application/Common/Interfaces/ISteamAuthService.cs

@@ -0,0 +1,11 @@
+using RecNet.Application.Common.Steam;
+
+namespace RecNet.Application.Common.Interfaces;
+
+public interface ISteamAuthService
+{
+    Task<SteamAuthResult> AuthorizeAsync(
+        string ticket,
+        uint appId,
+        CancellationToken ct = default);
+}