FEAT-12a: POST /gerbils/sale-ad endpoint (503 AiKeyMissing when unconfigured, 502 AiUpstreamError) + DI wiring

GerbilManagerWebAPI/Program.cs

@@ -35,6 +35,13 @@ builder.Services.AddCors(options => options.AddPolicy(LanCorsPolicy, policy =>
 // OpenAPI document for the Scalar API reference (Swashbuckle removed).
 builder.Services.AddOpenApi();
 
+// FEAT-12a: provider-agnostic AI config (env vars AI__BaseUrl/AI__ApiKey/AI__Model
+// or user-secrets — never committed) + typed client for sale-ad generation.
+builder.Services.AddOptions<GerbilManagerWebAPI.SaleAd.AiOptions>()
+    .BindConfiguration(GerbilManagerWebAPI.SaleAd.AiOptions.SectionName);
+builder.Services.AddHttpClient<GerbilManagerWebAPI.SaleAd.SaleAdService>(
+    http => http.Timeout = TimeSpan.FromSeconds(60));
+
 var app = builder.Build();
 
 app.MapDefaultEndpoints();
@@ -62,5 +69,6 @@ app.MapHealthRecordEndpoints();
 app.MapWeightRecordEndpoints();
 app.MapInbreedingEndpoints();
 app.MapPhotoEndpoints();
+app.MapSaleAdEndpoints();
 
 app.Run();