Add Active Buffs management and UI integration

Scripts/Core/Effects/Buff.cs

@@ -1,7 +1,11 @@
+using System;
+
 namespace ParasiticGod.Scripts.Core.Effects;
 
 public class Buff
 {
+    public Guid Id { get; } = Guid.NewGuid(); // Unique identifier
+    public string Name { get; set; } // For display purposes
     public float Multiplier { get; set; } = 1.0f;
     public double Duration { get; set; }
 }