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

feat(emailer): add Postmark and Resend providers

backend/Modules/Creators/Features/ChangeTitle.cs

@@ -0,0 +1,37 @@
+using Hutopy.Modules.Creators.Data;
+
+namespace Hutopy.Modules.Creators.Features;
+
+[PublicAPI]
+public record ChangeTitleRequest(
+    Guid CreatorId,
+    string? Title);
+
+[PublicAPI]
+public class ChangeTitleHandler(
+    CreatorsDbContext context)
+    : Endpoint<ChangeTitleRequest>
+{
+    public override void Configure()
+    {
+        Post("/api/creators/{CreatorId}/title");
+        Options(o => o.WithTags("Creators"));
+    }
+
+    public override async Task HandleAsync(
+        ChangeTitleRequest request, 
+        CancellationToken ct)
+    {
+        var creator = await context
+            .Creators
+            .SingleAsync(
+                c => c.Id == request.CreatorId,
+                cancellationToken: ct);
+
+        creator.Title = request.Title;
+
+        await context.SaveChangesAsync(ct);
+
+        await SendOkAsync(ct);
+    }
+}