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

feat(emailer): add Postmark and Resend providers

backend/Modules/Messaging/Handlers/GetMessagesByUser.cs

@@ -0,0 +1,59 @@
+using Hutopy.Modules.Identity.Contracts;
+using Hutopy.Modules.Messaging.Data;
+using Hutopy.Modules.Messaging.Models;
+
+namespace Hutopy.Modules.Messaging.Handlers;
+
+[PublicAPI]
+public class GetMessagesByUserRequest
+{
+    public Guid UserId { get; set; }
+}
+
+[PublicAPI]
+public record struct GetMessagesByUserResponse(
+    IEnumerable<MessageDto> Messages);
+
+public class GetMessagesByUser(
+    IUserLookup userLookup,
+    MessagingDbContext context)
+    : Endpoint<GetMessagesByUserRequest, GetMessagesByUserResponse>
+{
+    public override void Configure()
+    {
+        Get("/api/messages/user/{UserId:guid}");
+        Options(o => o.WithTags("Messages"));
+        AllowAnonymous();
+    }
+
+    public override async Task HandleAsync(
+        GetMessagesByUserRequest req,
+        CancellationToken ct)
+    {
+        var messages = await context
+            .Messages
+            .Where(c => c.CreatedBy == req.UserId)
+            .Where(c => c.ParentId == null)
+            .ToListAsync(cancellationToken: ct);
+
+        var result = await Task.WhenAll(
+            messages.Select(async message =>
+            {
+                var user = await userLookup.GetUserAsync(message.CreatedBy, ct);
+
+                return new MessageDto
+                {
+                    Id = message.Id,
+                    ParentId = message.ParentId,
+                    CreatedAt = message.CreatedAt,
+                    CreatedBy = message.CreatedBy,
+                    CreatedByName = user?.Fullname ?? "Unknown User",
+                    CreatedByPortraitUrl = user?.PortraitUrl ?? "",
+                    SubjectId = message.SubjectId,
+                    Value = message.Value
+                };
+            }));
+
+        await SendOkAsync(new GetMessagesByUserResponse(result), ct);
+    }
+}