wip: partial implementation salvaged from interrupted workflow run

Untrusted draft — no build/test had run yet. Review before building on it.

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

ErsatzTV/Controllers/Api/HealthController.cs

@@ -0,0 +1,18 @@
+using ErsatzTV.Application.Health;
+using ErsatzTV.Core.Api.Health;
+using MediatR;
+using Microsoft.AspNetCore.Mvc;
+
+namespace ErsatzTV.Controllers.Api;
+
+[ApiController]
+[EndpointGroupName("general")]
+public class HealthController(IMediator mediator) : ControllerBase
+{
+    [HttpGet("/api/health")]
+    [Tags("Health")]
+    [EndpointSummary("Get health check results")]
+    [ProducesResponseType(typeof(List<HealthCheckResponseModel>), StatusCodes.Status200OK)]
+    public async Task<List<HealthCheckResponseModel>> GetAll(CancellationToken cancellationToken) =>
+        await mediator.Send(new GetAllHealthCheckResultsForApi(), cancellationToken);
+}