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.api/Controllers/ProjectsController.cs

@@ -1,3 +1,4 @@
+using MediatR;
 using Microsoft.AspNetCore.Authorization;
 using Microsoft.AspNetCore.Mvc;
 using Mws.Application.Projects;
@@ -7,49 +8,49 @@ namespace Mws.Api.Controllers;
 [ApiController]
 [Route("api/projects")]
 [Authorize]
-public class ProjectsController(IProjectService projectService) : ControllerBase
+public class ProjectsController(ISender sender) : ControllerBase
 {
     [HttpGet]
     public async Task<ActionResult<List<ProjectDto>>> GetAll(CancellationToken ct)
     {
-        return Ok(await projectService.GetProjectsAsync(User.GetUserId(), ct));
+        return Ok(await sender.Send(new GetProjectsQuery(User.GetUserId()), ct));
     }
 
     [HttpGet("search")]
     public async Task<ActionResult<List<ProjectDto>>> Search([FromQuery] string? q, CancellationToken ct)
     {
-        return Ok(await projectService.SearchAsync(User.GetUserId(), q ?? string.Empty, ct));
+        return Ok(await sender.Send(new SearchProjectsQuery(User.GetUserId(), q ?? string.Empty), ct));
     }
 
     [HttpGet("{projectId:guid}")]
     public async Task<ActionResult<ProjectDto>> Get(Guid projectId, CancellationToken ct)
     {
-        return Ok(await projectService.GetProjectAsync(User.GetUserId(), projectId, ct));
+        return Ok(await sender.Send(new GetProjectQuery(User.GetUserId(), projectId), ct));
     }
 
     [HttpGet("{projectId:guid}/overview")]
     public async Task<ActionResult<ProjectOverviewDto>> Overview(Guid projectId, CancellationToken ct)
     {
-        return Ok(await projectService.GetOverviewAsync(User.GetUserId(), projectId, ct));
+        return Ok(await sender.Send(new GetProjectOverviewQuery(User.GetUserId(), projectId), ct));
     }
 
     [HttpPost]
     public async Task<ActionResult<ProjectDto>> Create([FromBody] CreateProjectRequest request, CancellationToken ct)
     {
-        var result = await projectService.CreateProjectAsync(User.GetUserId(), request, ct);
+        var result = await sender.Send(new CreateProjectCommand(User.GetUserId(), request), ct);
         return CreatedAtAction(nameof(Get), new { projectId = result.Id }, result);
     }
 
     [HttpPut("{projectId:guid}")]
     public async Task<ActionResult<ProjectDto>> Update(Guid projectId, [FromBody] UpdateProjectRequest request, CancellationToken ct)
     {
-        return Ok(await projectService.UpdateProjectAsync(User.GetUserId(), projectId, request, ct));
+        return Ok(await sender.Send(new UpdateProjectCommand(User.GetUserId(), projectId, request), ct));
     }
 
     [HttpDelete("{projectId:guid}")]
     public async Task<IActionResult> Delete(Guid projectId, CancellationToken ct)
     {
-        await projectService.ArchiveProjectAsync(User.GetUserId(), projectId, ct);
+        await sender.Send(new ArchiveProjectCommand(User.GetUserId(), projectId), ct);
         return NoContent();
     }
-}
+}