0.2 Minimal Program.cs

Wire up MVC controllers and add GET /health returning
{ status: "Healthy", mqttConnected: false } (mqttConnected hardcoded
until the MQTT publisher lands). Switch launchSettings.json to port
8080 so the DoD curl works out of the box.

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

src/FrameProcessor/Controllers/HealthController.cs

@@ -0,0 +1,11 @@
+using Microsoft.AspNetCore.Mvc;
+
+namespace FrameProcessor.Controllers;
+
+[ApiController]
+[Route("health")]
+public class HealthController : ControllerBase
+{
+    [HttpGet]
+    public IActionResult Get() => Ok(new { status = "Healthy", mqttConnected = false });
+}