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/api/src/cloud-spi/types.ts

@@ -77,6 +77,48 @@ export interface CloudServiceStatus {
     errorCode: string | null
 }
 
+/** One service as the runtime itself reports it, which can be far more than the console covers. */
+export interface EmulatedServiceStatus {
+    /** The runtime's own service id, e.g. `states` or `elasticloadbalancing`. */
+    name: string
+    state: string
+    /** Console pages backed by this service; empty when the console has none yet. */
+    consolePages: Array<{service: CloudServiceType; displayName: string; route: string}>
+}
+
+/** A container the runtime started to back a resource, as reported by its diagnostics. */
+export interface RuntimeContainer {
+    kind: 'ec2-instance'
+    resourceId: string
+    status: string | null
+    sshHost: string | null
+    sshPort: number | null
+}
+
+export interface RuntimeDiagnostics {
+    cloud: CloudProvider
+    checkedAt: string
+    runtime: {
+        status: RuntimeReachability
+        endpoint: string | null
+        latencyMs: number | null
+        error: string | null
+        version: string | null
+        edition: string | null
+    }
+    /** Null when the runtime does not publish a per-service list. */
+    emulatedServices: EmulatedServiceStatus[] | null
+    consoleServices: CloudServiceStatus[]
+    /** Null when the runtime does not publish container diagnostics. */
+    containers: RuntimeContainer[] | null
+    console: {
+        startedAt: string
+        uptimeSeconds: number
+        authMode: 'local' | 'oidc'
+        activeSessions: number
+    }
+}
+
 export type FieldType = 'text' | 'textarea' | 'password' | 'select' | 'file' | 'key-value'
 
 export interface FieldSchema {