DATA-2: new schema entities + Minimal API endpoints + Scalar + DAL teardown

- Entities: Breeder->Contact, +Enclosure/ColorVariety/GerbilPhoto/HealthRecord/WeightRecord;
  Gerbil expanded (single Genotype text col, Status/Gender enums-as-string, FK ids,
  ImportSource/ExternalRef provenance); Litter Strength->TotalBorn +ExpectedGoHomeDate/Notes.
  ColorVariety HasData seed = 18 from GEN-1 catalog. Gerbil<->Litter cycle handled
  (SetNull/Restrict). Enums stored as strings.
- Minimal API (no controllers): Endpoints/*.cs MapGroup+TypedResults for gerbils, litters,
  contacts, enclosures, color-varieties, health/weight-records, inbreeding (converted from
  controller, same routes/shapes), photos (Oscar contract: GET array/POST multipart/DELETE,
  url /photos/files/{fileName}). Gridify paged {items,totalCount,page,pageSize}, camelCase,
  409 conflict-deletes, flat FK ids, litter parent-gender validation (400 {code,...}).
- Scalar replaces Swashbuckle (AddOpenApi/MapOpenApi + MapScalarApiReference at /scalar);
  launchUrl swagger->scalar. GenericRepository/UnitOfWork/Converters deleted; DbContext direct.
- InbreedingService reads real FK props now; pure calculator + 8 tests untouched.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

GerbilManagerWebAPI/Genetics/InbreedingService.cs

@@ -32,22 +32,12 @@ namespace GerbilManagerWebAPI.Genetics
 
         private PedigreeCalculator BuildCalculator()
         {
-            var litters = _db.Set<Litter>()
-                .Select(l => new
-                {
-                    l.Id,
-                    FatherId = EF.Property<Guid?>(l, "FatherId"),
-                    MotherId = EF.Property<Guid?>(l, "MotherId"),
-                })
+            var litters = _db.Litters
+                .Select(l => new { l.Id, l.FatherId, l.MotherId })
                 .ToDictionary(l => l.Id, l => (l.FatherId, l.MotherId));
 
-            var gerbils = _db.Set<Gerbil>()
-                .Select(g => new
-                {
-                    g.Id,
-                    g.Name,
-                    LitterId = EF.Property<Guid?>(g, "LitterId"),
-                })
+            var gerbils = _db.Gerbils
+                .Select(g => new { g.Id, g.Name, g.LitterId })
                 .ToList();
 
             var parents = new Dictionary<Guid, (Guid? Father, Guid? Mother)>(gerbils.Count);