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/GerbilEndpoints.cs

@@ -0,0 +1,97 @@
+using GerbilManagerWebAPI.Common;
+using GerbilManagerWebAPI.Dtos;
+using GerbilManagerWebAPI.Models;
+using Gridify;
+using Microsoft.AspNetCore.Http.HttpResults;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.EntityFrameworkCore;
+
+namespace GerbilManagerWebAPI.Endpoints
+{
+    public static class GerbilEndpoints
+    {
+        public static IEndpointRouteBuilder MapGerbilEndpoints(this IEndpointRouteBuilder app)
+        {
+            var group = app.MapGroup("/gerbils").WithTags("Gerbils");
+
+            // GET /gerbils  (Gridify: filter/order/page; e.g. status==Active, litterId==…, orderBy=name)
+            group.MapGet("/", async ([AsParameters] GridifyQuery query, ApplicationContext db) =>
+                TypedResults.Ok(await db.Gerbils.AsNoTracking()
+                    .ToPagedResultAsync(query, ToDto)));
+
+            // GET /gerbils/{id}
+            group.MapGet("/{id:guid}", async Task<Results<Ok<GerbilDto>, NotFound>> (Guid id, ApplicationContext db) =>
+            {
+                var g = await db.Gerbils.AsNoTracking().FirstOrDefaultAsync(x => x.Id == id);
+                return g is null ? TypedResults.NotFound() : TypedResults.Ok(ToDto(g));
+            });
+
+            // POST /gerbils
+            group.MapPost("/", async Task<Results<Created<GerbilDto>, ValidationProblem>> (GerbilInput input, ApplicationContext db) =>
+            {
+                if (string.IsNullOrWhiteSpace(input.Name))
+                    return TypedResults.ValidationProblem(new Dictionary<string, string[]> { ["name"] = ["Name is required."] });
+
+                var g = new Gerbil { Id = Guid.NewGuid(), Name = input.Name };
+                Apply(g, input, isCreate: true);
+                db.Gerbils.Add(g);
+                await db.SaveChangesAsync();
+                return TypedResults.Created($"/gerbils/{g.Id}", ToDto(g));
+            });
+
+            // PUT /gerbils/{id}
+            group.MapPut("/{id:guid}", async Task<Results<NoContent, NotFound>> (Guid id, GerbilInput input, ApplicationContext db) =>
+            {
+                var g = await db.Gerbils.FirstOrDefaultAsync(x => x.Id == id);
+                if (g is null) return TypedResults.NotFound();
+                g.Name = input.Name;
+                Apply(g, input, isCreate: false);
+                await db.SaveChangesAsync();
+                return TypedResults.NoContent();
+            });
+
+            // DELETE /gerbils/{id}  (409 if referenced as a litter parent)
+            group.MapDelete("/{id:guid}", async Task<Results<NoContent, NotFound, Conflict<string>>> (Guid id, ApplicationContext db) =>
+            {
+                var g = await db.Gerbils.FirstOrDefaultAsync(x => x.Id == id);
+                if (g is null) return TypedResults.NotFound();
+                db.Gerbils.Remove(g);
+                try
+                {
+                    await db.SaveChangesAsync();
+                    return TypedResults.NoContent();
+                }
+                catch (DbUpdateException)
+                {
+                    return TypedResults.Conflict("Gerbil is referenced as a litter parent and cannot be deleted.");
+                }
+            });
+
+            return app;
+        }
+
+        private static void Apply(Gerbil g, GerbilInput i, bool isCreate)
+        {
+            g.Gender = i.Gender;
+            g.Status = i.Status ?? (isCreate ? GerbilStatus.Active : g.Status);
+            g.LitterId = i.LitterId;
+            g.OriginContactId = i.OriginContactId;
+            g.ReceiverContactId = i.ReceiverContactId;
+            g.EnclosureId = i.EnclosureId;
+            g.ColorVarietyId = i.ColorVarietyId;
+            g.DateOfBirth = i.DateOfBirth;
+            g.DateOfDeath = i.DateOfDeath;
+            g.CauseOfDeath = i.CauseOfDeath;
+            g.GoHomeDate = i.GoHomeDate;
+            g.Genotype = i.Genotype;
+            g.Notes = i.Notes;
+            g.ImportSource = i.ImportSource;
+            g.ExternalRef = i.ExternalRef;
+        }
+
+        internal static GerbilDto ToDto(Gerbil g) => new(
+            g.Id, g.Name, g.Gender, g.Status, g.LitterId, g.OriginContactId, g.ReceiverContactId,
+            g.EnclosureId, g.ColorVarietyId, g.DateOfBirth, g.DateOfDeath, g.CauseOfDeath,
+            g.GoHomeDate, g.Genotype, g.Notes, g.ImportSource, g.ExternalRef);
+    }
+}