Fix staging Aspire CLI install command for polyglot apphost.ts support

samples/Metrics/MetricsApp.AppHost/apphost.ts

@@ -0,0 +1,33 @@
+// Setup: No additional packages required (uses core container and project APIs).
+//
+// AddOpenTelemetryCollector is a custom AppHost extension method defined in the C# project
+// (MetricsApp.AppHost.OpenTelemetryCollector) and requires [AspireExport] to be available here.
+
+import { createBuilder } from "./.modules/aspire.js";
+
+const builder = await createBuilder();
+
+const prometheus = await builder.addContainer("prometheus", "prom/prometheus", "v3.2.1")
+    .withBindMount("../prometheus", "/etc/prometheus", true)
+    .withArgs("--web.enable-otlp-receiver", "--config.file=/etc/prometheus/prometheus.yml")
+    .withHttpEndpoint({ targetPort: 9090 });
+// POLYGLOT GAP: .WithUrlForEndpoint("http", u => u.DisplayText = "Prometheus Dashboard") — lambda URL customization is not available.
+
+const prometheusHttpEndpoint = prometheus.getEndpoint("http");
+
+const grafana = await builder.addContainer("grafana", "grafana/grafana")
+    .withBindMount("../grafana/config", "/etc/grafana", true)
+    .withBindMount("../grafana/dashboards", "/var/lib/grafana/dashboards", true)
+    .withEnvironment("PROMETHEUS_ENDPOINT", prometheusHttpEndpoint)
+    .withHttpEndpoint({ targetPort: 3000 });
+// POLYGLOT GAP: .WithUrlForEndpoint("http", u => u.DisplayText = "Grafana Dashboard") — lambda URL customization is not available.
+
+// POLYGLOT GAP: AddOpenTelemetryCollector("otelcollector", ...) is a custom C# extension
+// method from MetricsApp.AppHost.OpenTelemetryCollector. To use it here, it would need
+// [AspireExport] annotation and to be distributed as a NuGet package.
+
+const app = builder.addProject("app")
+    .withEnvironment("GRAFANA_URL", grafana.getEndpoint("http"));
+// POLYGLOT GAP: .WithUrlForEndpoint callbacks for display text/location are not available.
+
+await builder.build().run();