Add skin color gene handling to PawnAppearanceData and update skin tone description logic. Enhance AIImages.dll to support special skin tones based on gene definitions, improving character appearance representation.

Source/AIImages/Models/PawnAppearanceData.cs

@@ -15,6 +15,7 @@ namespace AIImages.Models
         public int Age { get; set; }
         public string BodyType { get; set; }
         public Color SkinColor { get; set; }
+        public List<string> SkinColorGeneDefNames { get; set; }
         public string HairStyle { get; set; }
         public string HairDefName { get; set; }
         public Color HairColor { get; set; }
@@ -25,6 +26,7 @@ namespace AIImages.Models
         {
             Traits = new List<Trait>();
             Apparel = new List<ApparelData>();
+            SkinColorGeneDefNames = new List<string>();
         }
     }