Commit MWS backend source tree

The ASP.NET Core solution (mws.api/mws.application/mws.domain/
mws.infrastructure) existed only as untracked working files. Adding
it to version control, plus a .gitignore for build output and local
tooling directories, so the CQRS/mediator refactor plan has a real
git history to branch and diff against.

mws.api/Controllers/ProjectMembersController.cs

@@ -0,0 +1,37 @@
+using Microsoft.AspNetCore.Authorization;
+using Microsoft.AspNetCore.Mvc;
+using Mws.Application.Projects;
+
+namespace Mws.Api.Controllers;
+
+[ApiController]
+[Route("api/projects/{projectId:guid}/members")]
+[Authorize]
+public class ProjectMembersController(IProjectMemberService memberService) : ControllerBase
+{
+    [HttpGet]
+    public async Task<ActionResult<List<ProjectMemberDto>>> GetAll(Guid projectId, CancellationToken ct)
+    {
+        return Ok(await memberService.GetMembersAsync(User.GetUserId(), projectId, ct));
+    }
+
+    [HttpPost]
+    public async Task<ActionResult<ProjectMemberDto>> Add(Guid projectId, [FromBody] AddMemberRequest request, CancellationToken ct)
+    {
+        return Ok(await memberService.AddMemberAsync(User.GetUserId(), projectId, request, ct));
+    }
+
+    [HttpPut("{userId:guid}/document-permissions")]
+    public async Task<ActionResult<ProjectMemberDto>> UpdateDocumentPermissions(
+        Guid projectId, Guid userId, [FromBody] UpdateMemberDocumentPermissionsRequest request, CancellationToken ct)
+    {
+        return Ok(await memberService.UpdateMemberDocumentPermissionsAsync(User.GetUserId(), projectId, userId, request, ct));
+    }
+
+    [HttpDelete("{userId:guid}")]
+    public async Task<IActionResult> Remove(Guid projectId, Guid userId, CancellationToken ct)
+    {
+        await memberService.RemoveMemberAsync(User.GetUserId(), projectId, userId, ct);
+        return NoContent();
+    }
+}