FEAT: Implement deceased/givenaway enclosure visibility rules, preserve external clan name, and hide receiver fields for deceased gerbils

GerbilManagerWebAPI/Models/Gerbil.cs

@@ -41,6 +41,8 @@ namespace GerbilManagerWebAPI.Models
         /// <summary>Compact genotype string (frozen GEN-1 contract). Null = not genotyped.</summary>
         public string? Genotype { get; set; }
 
+        public string? SpottingType { get; set; }
+
         public string? Notes { get; set; }
 
         // Provenance (for the FEAT-8 spreadsheet import).
@@ -80,6 +82,7 @@ namespace GerbilManagerWebAPI.Models
         /// Defaults true (manually-added animals are own stock); the FEAT-8 import classifies
         /// imported animals. See hive/agents/god/OWNERSHIP-residency.md. Gridify-filterable.</summary>
         public bool IsResident { get; set; } = true;
+        public bool IsCastrated { get; set; }
     }
 
     /// <summary>Shared normalisation for the separator-insensitive name search.</summary>