Add modifier post assignment-check

MiraAPI/Modifiers/ModifierManager.cs

@@ -152,7 +152,7 @@ public static class ModifierManager
                 }
 
                 var candidates = availablePlayers
-                    .Where(x => IsGameModifierValid(x, modifier, modifier.TypeId))
+                    .Where(x => IsGameModifierPostCheck(x, modifier, modifier.TypeId))
                     .ToList();
 
                 if (candidates.Count == 0)
@@ -181,4 +181,9 @@ public static class ModifierManager
                !player.HasModifier(modifierId) && modifier.IsModifierValidOn(player.Data.Role) &&
                modifier.CanSpawnOnCurrentMode();
     }
+    private static bool IsGameModifierPostCheck(PlayerControl player, GameModifier modifier, uint modifierId)
+    {
+        return (player.Data.Role is not ICustomRole role || role.IsModifierApplicable(modifier)) &&
+               !player.HasModifier(modifierId) && modifier.IsModifierValidOnPostCheck(player.Data.Role);
+    }
 }

MiraAPI/Modifiers/Types/GameModifier.cs

@@ -33,6 +33,13 @@ public abstract class GameModifier : BaseModifier
     /// <returns><see langword="true"/> if the modifier is valid on the role, otherwise <see langword="false"/>.</returns>
     public virtual bool IsModifierValidOn(RoleBehaviour role) => true;
 
+    /// <summary>
+    /// Determines whether the modifier is valid on a role, which runs after players are determined but before the modifiers are given.
+    /// </summary>
+    /// <param name="role">The role to be checked.</param>
+    /// <returns><see langword="true"/> if the modifier is valid on the role, otherwise <see langword="false"/>.</returns>
+    public virtual bool IsModifierValidOnPostCheck(RoleBehaviour role) => IsModifierValidOn(role);
+
     /// <summary>
     /// Determines whether the player won the game with this modifier. The modifier with the highest priority will override other modifiers.
     /// </summary>