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

feat(emailer): add Postmark and Resend providers

backend/Modules/Creators/Services/CreatorLookup.cs

@@ -0,0 +1,26 @@
+using Hutopy.Modules.Creators.Contracts;
+using Hutopy.Modules.Creators.Data;
+
+namespace Hutopy.Modules.Creators.Services;
+
+public sealed class CreatorLookup(
+    CreatorsDbContext context)
+    : ICreatorLookup
+{
+    public async Task<CreatorReference?> GetCreatorAsync(Guid creatorId, CancellationToken cancellationToken)
+    {
+        Creator? creator = await context
+            .Creators
+            .FirstOrDefaultAsync(c => c.Id == creatorId, cancellationToken);
+
+        return creator is null
+            ? null
+            : new CreatorReference(
+                creator.Id,
+                creator.Name,
+                creator.PortraitUrl,
+                creator.IsStripeDetailsSubmitted,
+                creator.IsStripeChargesEnabled,
+                creator.StripeAccountId);
+    }
+}