refactor: remove some unused code

Myriad/Types/Activity.cs

@@ -1,22 +1,17 @@
-namespace Myriad.Types
+namespace Myriad.Types;
+
+public record Activity
 {
-    public record Activity: ActivityPartial
-    {
-    }
+    public string Name { get; init; }
+    public ActivityType Type { get; init; }
+    public string? Url { get; init; }
+}
 
-    public record ActivityPartial
-    {
-        public string Name { get; init; }
-        public ActivityType Type { get; init; }
-        public string? Url { get; init; }
-    }
-
-    public enum ActivityType
-    {
-        Game = 0,
-        Streaming = 1,
-        Listening = 2,
-        Custom = 4,
-        Competing = 5
-    }
+public enum ActivityType
+{
+    Game = 0,
+    Streaming = 1,
+    Listening = 2,
+    Custom = 4,
+    Competing = 5
 }

Myriad/Types/Permissions.cs

@@ -1,6 +0,0 @@
-namespace Myriad.Types
-{
-    public static class Permissions
-    {
-    }
-}