M5: Windows client moderation UI; add C ABI getters for account list, user mute/deafen, channel topic

clients/windows/VoiceCat.Interop/Enums.cs

@@ -88,6 +88,10 @@ public enum VcEventType
     JoinResult = 12,
     /// <summary>M4: the TOFU server-identity gate — see VcTofuStatus.</summary>
     ServerIdentity = 13,
+    /// <summary>M5: async result for moderation/admin/channel operations.</summary>
+    GenericResult = 14,
+    /// <summary>M5: reply to VoiceCatClient.RequestAccountList — call ListAccounts() to read.</summary>
+    AccountList = 15,
 }
 
 /// <summary>