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/Endpoints/InbreedingEndpoints.cs

@@ -0,0 +1,33 @@
+using GerbilManagerWebAPI.Dtos;
+using GerbilManagerWebAPI.Genetics;
+using Microsoft.AspNetCore.Http.HttpResults;
+
+namespace GerbilManagerWebAPI.Endpoints
+{
+    /// <summary>
+    /// Inzuchtkoeffizient endpoints (FEAT-1b). Routes/response shapes are IDENTICAL to
+    /// the former InbreedingController — only the hosting style changed to Minimal API.
+    /// </summary>
+    public static class InbreedingEndpoints
+    {
+        public static IEndpointRouteBuilder MapInbreedingEndpoints(this IEndpointRouteBuilder app)
+        {
+            // GET /gerbils/{id}/inbreeding-coefficient
+            app.MapGet("/gerbils/{id:guid}/inbreeding-coefficient",
+                Results<Ok<InbreedingResult>, NotFound> (Guid id, ApplicationContext db) =>
+                {
+                    var result = new InbreedingService(db).ForGerbil(id);
+                    return result is null ? TypedResults.NotFound() : TypedResults.Ok(result);
+                })
+                .WithTags("Inbreeding");
+
+            // POST /genetics/test-inbreeding
+            app.MapPost("/genetics/test-inbreeding",
+                Ok<InbreedingResult> (TestInbreedingDto dto, ApplicationContext db) =>
+                    TypedResults.Ok(new InbreedingService(db).ForPairing(dto.FatherId, dto.MotherId)))
+                .WithTags("Inbreeding");
+
+            return app;
+        }
+    }
+}