feat: add a runtime diagnostics page

Adds GET /api/clouds/:cloud/diagnostics and a Diagnostics page in the
General nav. The report combines, in one call:

- runtime reachability, latency, version and edition from /_floci/health
- every service the runtime emulates, with the console pages backed by it
- per-console-service probes (the existing status check)
- EC2 instance containers from /_floci/diagnose
- console uptime, sign-in mode and active session count

Each source is optional, so a down runtime still yields a partial report.

packages/frontend/src/api/api.ts

@@ -13,6 +13,7 @@ export const apiEndpointKeys = {
     list: "clouds.list",
     services: "clouds.services.list",
     status: "clouds.status.get",
+    diagnostics: "clouds.diagnostics.get",
     serviceStatus: "clouds.services.status.get",
     schema: "clouds.services.schema.get",
     dependencies: "clouds.services.dependencies.get",
@@ -323,6 +324,13 @@ export const endpointRegistry: EndpointRegistry = new Map([
       method: "GET",
     },
   ],
+  [
+    apiEndpointKeys.clouds.diagnostics,
+    {
+      path: "/clouds/:cloud/diagnostics",
+      method: "GET",
+    },
+  ],
   [
     apiEndpointKeys.clouds.serviceStatus,
     {

packages/frontend/src/api/cloudProxyClient.ts

@@ -6,6 +6,7 @@ import type {
   CloudServiceStatus,
   CloudServiceType,
   CloudStatus,
+  RuntimeDiagnostics,
 } from "@/types/cloud";
 import type {
   AppConfigConfigurationProfile,
@@ -86,6 +87,18 @@ export async function getCloudStatus(
   return res.data;
 }
 
+export async function getCloudDiagnostics(
+  cloud: CloudProvider,
+  signal?: AbortSignal,
+): Promise<RuntimeDiagnostics> {
+  const res = await apiClient.call<RuntimeDiagnostics>(
+    apiEndpointKeys.clouds.diagnostics,
+    requestOptions(cloud, "cloud-proxy", { signal }),
+    { cloud },
+  );
+  return res.data;
+}
+
 export async function getCloudServiceStatus(
   cloud: CloudProvider,
   service: CloudServiceType,

packages/frontend/src/api/queries/cloudQueries.ts

@@ -1,5 +1,6 @@
 import {useQuery} from '@tanstack/react-query'
 import {
+    getCloudDiagnostics,
     getCloudResource,
     getCloudServiceStatus,
     getCloudStatus,
@@ -20,6 +21,7 @@ export const cloudQueryKeys = {
     clouds: ['clouds'] as const,
     services: (cloud: CloudProvider) => ['cloud-services', cloud] as const,
     status: (cloud: CloudProvider) => ['cloud-status', cloud] as const,
+    diagnostics: (cloud: CloudProvider) => ['cloud-diagnostics', cloud] as const,
     serviceStatus: (cloud: CloudProvider, service: CloudServiceType) =>
         ['cloud-service-status', cloud, service] as const,
     resources: (cloud: CloudProvider, service: CloudServiceType) =>
@@ -53,6 +55,15 @@ export function useCloudStatusQuery(cloud: CloudProvider, options: {refetchInter
     })
 }
 
+/** Full runtime report; polled slowly because it probes every console service. */
+export function useCloudDiagnosticsQuery(cloud: CloudProvider) {
+    return useQuery({
+        queryKey: cloudQueryKeys.diagnostics(cloud),
+        queryFn: ({signal}) => getCloudDiagnostics(cloud, signal),
+        refetchInterval: 30_000,
+    })
+}
+
 /** Health of the single service being viewed, rather than of the whole cloud. */
 export function useCloudServiceStatusQuery(
     cloud: CloudProvider,