Reuse heartbeat container state and batch host RCON status

src/lib/hosts.ts

@@ -70,6 +70,10 @@ export interface HostInventory {
     agentUpdate?: HostAgentUpdate;
     instanceResources?: InstanceResources[];
     instanceResourcesError?: string;
+    instanceStates?: InstanceState[];
+}
+export interface InstanceState {
+    instanceId: string; generation: number; state: string; healthy: boolean; observedAt: string;
 }
 export interface InstanceResources {
     instanceId: string; generation: number; uptimeSeconds: number; cpuCores: number; memoryBytes: number;