many fixes and improvements - rework for modules/ and common/

feat(emailer): add Postmark and Resend providers

backend/Modules/Identity/Data/IdentityDbContext.cs

@@ -0,0 +1,20 @@
+using Microsoft.AspNetCore.Identity.EntityFrameworkCore;
+
+namespace Hutopy.Modules.Identity.Data
+{
+    public class IdentityDbContext(
+        DbContextOptions<IdentityDbContext> options)
+        : IdentityDbContext<User, Role, Guid>(options)
+    {
+        public const string SchemaName = "Identity";
+        
+        protected override void OnModelCreating(ModelBuilder 
+            modelBuilder)
+        {
+            base.OnModelCreating(modelBuilder);
+            
+            modelBuilder.HasDefaultSchema(SchemaName);
+        }
+
+    }
+}