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

feat(emailer): add Postmark and Resend providers

backend/Modules/Messaging/Handlers/GetMessages.cs

@@ -0,0 +1,42 @@
+using Hutopy.Modules.Messaging.Data;
+using Hutopy.Modules.Messaging.Models;
+
+namespace Hutopy.Modules.Messaging.Handlers;
+
+[PublicAPI]
+public sealed class GetMessagesRequest
+{
+    public Guid SubjectId { get; set; }
+    [BindFrom("page_size")] public int PageSize { get; set; } = 10;
+    [BindFrom("last_id")] public Guid? LastId { get; set; }
+}
+
+[PublicAPI]
+public record struct GetMessagesResponse(
+    IEnumerable<MessageDto> Messages);
+
+public class GetMessages(
+    MessagingDbContext context)
+    : Endpoint<GetMessagesRequest, GetMessagesResponse>
+{
+    public override void Configure()
+    {
+        Get("/api/messages/{SubjectId:guid}");
+        Options(o => o.WithTags("Messages"));
+        AllowAnonymous();
+    }
+
+    public override async Task HandleAsync(
+        GetMessagesRequest req,
+        CancellationToken ct)
+    {
+        var messages = await context.GetMessagesAsync(
+            req.SubjectId,
+            null,
+            req.LastId,
+            req.PageSize,
+            ct);
+        
+        await SendOkAsync(new GetMessagesResponse(messages), ct);
+    }
+}