Convert Projects module to MediatR commands/queries

Replaces IProjectService/ProjectService. IProjectMemberService is
left in place for now — ProjectMembersController still depends on it
until the next task converts it too.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

mws.application/Projects/Queries/GetProjectOverview.cs

@@ -0,0 +1,35 @@
+using AutoMapper;
+using MediatR;
+using Mws.Application.Common;
+using Mws.Domain.Documents;
+
+namespace Mws.Application.Projects;
+
+public record GetProjectOverviewQuery(Guid UserId, Guid ProjectId) : IRequest<ProjectOverviewDto>;
+
+public class GetProjectOverviewHandler(IUnitOfWork uow, IMapper mapper) : IRequestHandler<GetProjectOverviewQuery, ProjectOverviewDto>
+{
+    public async Task<ProjectOverviewDto> Handle(GetProjectOverviewQuery query, CancellationToken ct)
+    {
+        var project = await ProjectAccess.GetForUserOrThrowAsync(uow, query.UserId, query.ProjectId, ct);
+
+        var memberCount = await uow.Projects.CountMembersAsync(query.ProjectId, ct);
+        var documentCount = await uow.Documents.CountByTypeForProjectAsync(query.ProjectId, DocumentType.Document, ct);
+
+        var taskCounts = await uow.Tasks.CountByStatusForProjectAsync(query.ProjectId, ct);
+        var taskCountsByStatus = taskCounts.ToDictionary(kv => kv.Key.ToString(), kv => kv.Value);
+
+        var recentTasks = await uow.Tasks.GetRecentForProjectAsync(query.ProjectId, 5, ct);
+        var recentDocuments = await uow.Documents.GetRecentForProjectAsync(query.ProjectId, DocumentType.Document, 5, ct);
+
+        return new ProjectOverviewDto
+        {
+            Project = mapper.Map<ProjectDto>(project),
+            MemberCount = memberCount,
+            DocumentCount = documentCount,
+            TaskCountsByStatus = taskCountsByStatus,
+            RecentTasks = mapper.Map<List<RecentTaskDto>>(recentTasks),
+            RecentDocuments = mapper.Map<List<RecentDocumentDto>>(recentDocuments),
+        };
+    }
+}