Refactor CORS config; add architectural commentary

Refactored CORS setup to be environment-aware, restricting origins in production and relaxing in development. Added extensive comments and discussion on service and repository layer design, including clean architecture best practices and CQRS/MediatR considerations. No changes to business logic; documentation and intent clarified for maintainers.

DbFirst.API/Program.cs

@@ -14,20 +14,22 @@ builder.Services.AddEndpointsApiExplorer();
 builder.Services.AddSwaggerGen();
 
 // TODO: allow listed origins configured in appsettings.json
+// In any case, dont let them to free to use without cors. if there is no origin specified, block all.
+// In development you can keep it easy.
 builder.Services.AddCors(options =>
-{
+{    
-    var origins = builder.Configuration.GetSection("Cors:AllowedOrigins").Get<string[]>() ?? Array.Empty<string>();
     options.AddDefaultPolicy(policy =>
     {
-        if (origins.Length > 0)
+        if(builder.Environment.IsDevelopment())
         {
-            policy.WithOrigins(origins)
+            policy.AllowAnyOrigin()
                   .AllowAnyHeader()
                   .AllowAnyMethod();
         }
         else
         {
-            policy.AllowAnyOrigin()
+            var origins = builder.Configuration.GetSection("Cors:AllowedOrigins").Get<string[]>() ?? [];
+            policy.WithOrigins(origins)
                   .AllowAnyHeader()
                   .AllowAnyMethod();
         }

DbFirst.Application/Catalogs/CatalogService.cs

@@ -21,7 +21,17 @@ Cons/Practical here:
 Conclusion: For this solution a generic service would be more overhead than benefit. If you later have multiple very similar entities without special logic,
 you could consider a lightweight generic interface/base; for now, the specialized service implementation is cleaner. */
 
+/* Hakan's Response: 
+ * No, it absolutely makes sense to create a generic service using Options pattern. So, you can easily inject your SQL queries or stored procedure names via configuration.
+ * see: https://docs.microsoft.com/en-us/dotnet/core/extensions/options
+ */
+
 //TODO: implement CQRS pattern with MediatR
+
+/* Hakan's response
+ * Here is the main part. We dont even need a service layer if we implement CQRS with MediatR at least for CRUD operations.
+ */
+
 public class CatalogService : ICatalogService
 {
     private readonly ICatalogRepository _repository;

DbFirst.Domain/Repositories/ICatalogRepository.cs

@@ -1,4 +1,5 @@
 using DbFirst.Domain.Entities;
+using System.Runtime.Intrinsics.X86;
 
 namespace DbFirst.Domain.Repositories;
 
@@ -11,6 +12,12 @@ A generic Repository<T> isn’t really worthwhile here:
     • Operations aren’t symmetric (separate procs for insert/update/delete with output handling and reload), so a one-size-fits-all CRUD pattern doesn’t fit well.
     • Better to keep the specialized repo.If you want reuse, extract small helpers (e.g., for proc calls/output parameters/reload) instead of forcing a generic repository. */
 
+
+/* Hakan's Response: 
+ * I think it still makes sense. An execute SQL method can be added to repository. The relevant SQL can be executed in the application layer.
+ * Because the application layer is no longer dependent on a method like CreateAsync. It is now directly dependent on that procedure.
+ */
+
 // TODO: move to application layer as a part of clean architecture
 
 /* Copilot's Response:
@@ -22,6 +29,12 @@ A generic Repository<T> isn’t really worthwhile here:
     Con: If Domain logic needs repos, it would depend on Application, weakening the layer separation.
     Recommendation: Keep the interface in Domain. It’s conventional, clean, and avoids a Domain -> Application dependency. Implementation stays in Infrastructure. */
 
+/* Hakan's Response:
+ *  I don't think there's any point in keeping repository interfaces in the domain layer. These interfaces will be used in the application layer, not the domain layer. 
+ *  Furthermore, this is how they are used in the most popular clean architecture pattern. 
+ *  See: https://github.com/jasontaylordev/CleanArchitecture/blob/main/src/Infrastructure/Identity/IdentityService.cs
+ */
+
 public interface ICatalogRepository
 {
     Task<List<VwmyCatalog>> GetAllAsync(CancellationToken cancellationToken = default);