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/AuthController.cs

@@ -0,0 +1,18 @@
+using Microsoft.AspNetCore.Authorization;
+using Microsoft.AspNetCore.Mvc;
+using Mws.Application.Auth;
+
+namespace Mws.Api.Controllers;
+
+[ApiController]
+[Route("api/auth")]
+[AllowAnonymous]
+public class AuthController(IAuthService authService) : ControllerBase
+{
+    [HttpPost("login")]
+    public async Task<ActionResult<LoginResponse>> Login([FromBody] LoginRequest request, CancellationToken ct)
+    {
+        var response = await authService.LoginAsync(request, ct);
+        return Ok(response);
+    }
+}