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/Dtos/ApiDtos.cs

@@ -0,0 +1,96 @@
+using GerbilManagerWebAPI.Models;
+
+namespace GerbilManagerWebAPI.Dtos
+{
+    // Response DTOs ----------------------------------------------------------
+    // Enums serialise as string names; JSON property names are camelCase (configured
+    // globally in Program.cs). FK references are FLAT ids (no nested objects) per the
+    // frontend contract (Kelly's pedigree + Oscar's filters depend on this).
+
+    public record GerbilDto(
+        Guid Id,
+        string Name,
+        Gender Gender,
+        GerbilStatus Status,
+        Guid? LitterId,
+        Guid? OriginContactId,
+        Guid? ReceiverContactId,
+        Guid? EnclosureId,
+        Guid? ColorVarietyId,
+        DateOnly? DateOfBirth,
+        DateOnly? DateOfDeath,
+        string? CauseOfDeath,
+        DateOnly? GoHomeDate,
+        string? Genotype,
+        string? Notes,
+        string? ImportSource,
+        string? ExternalRef);
+
+    public record LitterDto(
+        Guid Id,
+        string Name,
+        DateOnly Date,
+        int? TotalBorn,
+        Guid? FatherId,
+        Guid? MotherId,
+        DateOnly? ExpectedGoHomeDate,
+        string? Notes);
+
+    public record ContactDto(Guid Id, string Name, string? ContactInfo, string? Notes);
+
+    public record EnclosureDto(Guid Id, string Name, string? Notes);
+
+    public record ColorVarietyDto(Guid Id, string Name, string? CanonicalGenotype, int SortOrder);
+
+    public record HealthRecordDto(
+        Guid Id, Guid GerbilId, DateOnly Date, HealthRecordType Type,
+        string Description, string? Veterinarian, DateTimeOffset CreatedAt);
+
+    public record WeightRecordDto(
+        Guid Id, Guid GerbilId, DateOnly Date, int WeightGrams, string? Notes);
+
+    public record PhotoDto(Guid Id, string FileName, string? Caption, int SortOrder, string Url);
+
+    // Request DTOs -----------------------------------------------------------
+
+    public record GerbilInput(
+        string Name,
+        Gender Gender,
+        GerbilStatus? Status,
+        Guid? LitterId,
+        Guid? OriginContactId,
+        Guid? ReceiverContactId,
+        Guid? EnclosureId,
+        Guid? ColorVarietyId,
+        DateOnly? DateOfBirth,
+        DateOnly? DateOfDeath,
+        string? CauseOfDeath,
+        DateOnly? GoHomeDate,
+        string? Genotype,
+        string? Notes,
+        string? ImportSource,
+        string? ExternalRef);
+
+    public record LitterInput(
+        string Name,
+        DateOnly Date,
+        int? TotalBorn,
+        Guid? FatherId,
+        Guid? MotherId,
+        DateOnly? ExpectedGoHomeDate,
+        string? Notes);
+
+    public record ContactInput(string Name, string? ContactInfo, string? Notes);
+
+    public record EnclosureInput(string Name, string? Notes);
+
+    public record ColorVarietyInput(string Name, string? CanonicalGenotype, int? SortOrder);
+
+    public record HealthRecordInput(
+        Guid GerbilId, DateOnly Date, HealthRecordType Type, string Description, string? Veterinarian);
+
+    public record WeightRecordInput(Guid GerbilId, DateOnly Date, int WeightGrams, string? Notes);
+
+    /// <summary>Hypothetical pairing request for POST /genetics/test-inbreeding.</summary>
+    public record TestInbreedingDto(Guid? FatherId, Guid? MotherId);
+}