feat: add Aspire dashboard OTEL workflow

Add OTLP export wiring for the sidecar and dev scripts to launch the standalone Aspire Dashboard during development.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

scripts/launch-aspire-dashboard.ts

@@ -0,0 +1,9 @@
+import { startAspireDashboard } from './aspireDashboard';
+
+const dashboard = await startAspireDashboard();
+
+console.log(
+  `${dashboard.startedByScript ? 'Started' : 'Reusing'} Aspire Dashboard at ${dashboard.dashboardUrl}`,
+);
+console.log(`OTLP/gRPC receiver: ${dashboard.otlpGrpcEndpoint}`);
+console.log(`OTLP/HTTP receiver: ${dashboard.otlpHttpEndpoint}`);