6.3 Wire MQTT publish into FramesController

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/FrameProcessor/Controllers/FramesController.cs

@@ -1,6 +1,7 @@
 using FrameProcessor.Configuration;
 using FrameProcessor.Domain;
 using FrameProcessor.ImagePipeline;
+using FrameProcessor.Mqtt;
 using FrameProcessor.Storage;
 using Microsoft.AspNetCore.Mvc;
 
@@ -13,12 +14,14 @@ public sealed class FramesController : ControllerBase
     private readonly FramesRegistry _frames;
     private readonly IImagePipeline _pipeline;
     private readonly ImageStore _store;
+    private readonly MqttPublisher _mqtt;
 
-    public FramesController(FramesRegistry frames, IImagePipeline pipeline, ImageStore store)
+    public FramesController(FramesRegistry frames, IImagePipeline pipeline, ImageStore store, MqttPublisher mqtt)
     {
         _frames = frames;
         _pipeline = pipeline;
         _store = store;
+        _mqtt = mqtt;
     }
 
     [HttpPost("{name}/image")]
@@ -43,13 +46,15 @@ public sealed class FramesController : ControllerBase
 
         await _store.WriteAsync(frame.Mac, pngBytes, cancellationToken).ConfigureAwait(false);
 
+        var publishResult = await _mqtt.PublishAsync(frame.Mac, cancellationToken).ConfigureAwait(false);
+
         return Ok(new
         {
             frame = frame.Name.Value,
             mac = frame.Mac.ToString(),
             url = $"/i/{frame.Mac}.png",
             processedAt = DateTimeOffset.UtcNow,
-            mqttPublished = false,
+            mqttPublished = publishResult == PublishResult.Success,
         });
     }
 }