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/GetProject.cs

@@ -0,0 +1,16 @@
+using AutoMapper;
+using MediatR;
+using Mws.Application.Common;
+
+namespace Mws.Application.Projects;
+
+public record GetProjectQuery(Guid UserId, Guid ProjectId) : IRequest<ProjectDto>;
+
+public class GetProjectHandler(IUnitOfWork uow, IMapper mapper) : IRequestHandler<GetProjectQuery, ProjectDto>
+{
+    public async Task<ProjectDto> Handle(GetProjectQuery query, CancellationToken ct)
+    {
+        var project = await ProjectAccess.GetForUserOrThrowAsync(uow, query.UserId, query.ProjectId, ct);
+        return mapper.Map<ProjectDto>(project);
+    }
+}