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/Program.cs

@@ -1,13 +1,14 @@
-using GerbilManagerWebAPI.DAL;
+using System.Text.Json.Serialization;
+using GerbilManagerWebAPI.Endpoints;
 using Microsoft.EntityFrameworkCore;
+using Scalar.AspNetCore;
 
 var builder = WebApplication.CreateBuilder(args);
 
 builder.AddServiceDefaults();
 
-// LAN reachability: bind on all interfaces so devices on the home network (the
-// SPA on a phone/laptop) can reach the API. We keep whatever port Aspire /
-// launchSettings assigned and only widen the host from localhost to 0.0.0.0.
+// LAN reachability: bind on all interfaces (keep the Aspire/launch-assigned port),
+// so phones/laptops on the home network can reach the API (trusted LAN, no auth).
 var aspnetUrls = Environment.GetEnvironmentVariable("ASPNETCORE_URLS");
 if (!string.IsNullOrWhiteSpace(aspnetUrls))
 {
@@ -17,43 +18,49 @@ if (!string.IsNullOrWhiteSpace(aspnetUrls))
     builder.WebHost.UseUrls(lanUrls);
 }
 
-// Add services to the container.
-
-builder.Services.AddControllers();
-// Learn more about configuring Swagger/OpenAPI at https://aka.ms/aspnetcore/swashbuckle
-builder.Services.AddEndpointsApiExplorer();
-builder.Services.AddSwaggerGen();
 builder.AddNpgsqlDbContext<ApplicationContext>("gerbilmanager");
-builder.Services.AddScoped<UnitOfWork>();
 
-// Permissive CORS for the trusted home LAN (no auth — see hive scope rule).
-// The SPA calls the API cross-origin from other devices on the network.
+// JSON: camelCase property names + enums serialised as their string names (frontend contract).
+builder.Services.ConfigureHttpJsonOptions(o =>
+{
+    o.SerializerOptions.PropertyNamingPolicy = System.Text.Json.JsonNamingPolicy.CamelCase;
+    o.SerializerOptions.Converters.Add(new JsonStringEnumConverter());
+});
+
+// Permissive CORS for the trusted home LAN (no auth — see board constraint).
 const string LanCorsPolicy = "lan";
 builder.Services.AddCors(options => options.AddPolicy(LanCorsPolicy, policy =>
     policy.AllowAnyOrigin().AllowAnyHeader().AllowAnyMethod()));
 
+// OpenAPI document for the Scalar API reference (Swashbuckle removed).
+builder.Services.AddOpenApi();
+
 var app = builder.Build();
 
 app.MapDefaultEndpoints();
 
-// Configure the HTTP request pipeline.
+// API reference at /scalar (built on the OpenAPI doc at /openapi/v1.json).
+app.MapOpenApi();
+app.MapScalarApiReference();
+
 if (app.Environment.IsDevelopment())
 {
-    app.UseSwagger();
-    app.UseSwaggerUI();
-
     // Aspire provisions an empty database in dev — bring the schema up to date.
     using var scope = app.Services.CreateScope();
     scope.ServiceProvider.GetRequiredService<ApplicationContext>().Database.Migrate();
 }
 
-// No HTTPS redirection: the LAN clients (phone) talk plain HTTP to avoid
-// dev-certificate trust issues on the device.
-
 app.UseCors(LanCorsPolicy);
 
-app.UseAuthorization();
-
-app.MapControllers();
+// Endpoint groups (Minimal API, no controllers).
+app.MapGerbilEndpoints();
+app.MapLitterEndpoints();
+app.MapContactEndpoints();
+app.MapEnclosureEndpoints();
+app.MapColorVarietyEndpoints();
+app.MapHealthRecordEndpoints();
+app.MapWeightRecordEndpoints();
+app.MapInbreedingEndpoints();
+app.MapPhotoEndpoints();
 
 app.Run();