DATA-2: amendments — GerbilStatus.ForSale, Contact structured fields, 73-variety seed

- GerbilStatus += ForSale ("Abzugeben", FEAT-12 sale listing); enum-as-string, no DB change.
- Contact: contactInfo -> structured email/phone/address (FEAT-13 sale contracts); name/notes kept.
- ColorVariety seed 18 -> 73 from Kevin's GEN-2 colorVarietySeed.generated.json (18 frozen first).
- Regenerated InitialCreate migration (Contacts email/phone/address cols, 73 seed rows).

GerbilManagerWebAPI/Endpoints/ContactEndpoints.cs

@@ -24,7 +24,7 @@ namespace GerbilManagerWebAPI.Endpoints
 
             group.MapPost("/", async (ContactInput input, ApplicationContext db) =>
             {
-                var c = new Contact { Id = Guid.NewGuid(), Name = input.Name, ContactInfo = input.ContactInfo, Notes = input.Notes };
+                var c = new Contact { Id = Guid.NewGuid(), Name = input.Name, Email = input.Email, Phone = input.Phone, Address = input.Address, Notes = input.Notes };
                 db.Contacts.Add(c);
                 await db.SaveChangesAsync();
                 return TypedResults.Created($"/contacts/{c.Id}", ToDto(c));
@@ -34,7 +34,7 @@ namespace GerbilManagerWebAPI.Endpoints
             {
                 var c = await db.Contacts.FirstOrDefaultAsync(x => x.Id == id);
                 if (c is null) return TypedResults.NotFound();
-                c.Name = input.Name; c.ContactInfo = input.ContactInfo; c.Notes = input.Notes;
+                c.Name = input.Name; c.Email = input.Email; c.Phone = input.Phone; c.Address = input.Address; c.Notes = input.Notes;
                 await db.SaveChangesAsync();
                 return TypedResults.NoContent();
             });
@@ -54,6 +54,6 @@ namespace GerbilManagerWebAPI.Endpoints
             return app;
         }
 
-        private static ContactDto ToDto(Contact c) => new(c.Id, c.Name, c.ContactInfo, c.Notes);
+        private static ContactDto ToDto(Contact c) => new(c.Id, c.Name, c.Email, c.Phone, c.Address, c.Notes);
     }
 }