feat: SSH card UX, agent version sync, persistent ssh_admin_ok (0.11.5)

Silent SSH probe on host card open; manual test feedback auto-hides. Persist ssh_admin_ok in DB (migration 019). After agent update read version from host and refresh UI.

frontend/src/utils/agentVersion.ts

@@ -42,3 +42,14 @@ export function isAgentVersionOutdated(
   if (lag === null) return true;
   return lag >= lagThreshold;
 }
+
+export function isAgentVersionNewer(
+  candidate: string | null | undefined,
+  current: string | null | undefined,
+): boolean {
+  const next = parseAgentVersion(candidate);
+  const prev = parseAgentVersion(current);
+  if (!next) return false;
+  if (!prev) return true;
+  return compareVersions(next, prev) > 0;
+}

frontend/src/utils/hostPatchBus.ts

@@ -0,0 +1,16 @@
+import type { HostDetail } from "../api";
+
+type HostPatchListener = (detail: HostDetail) => void;
+
+const listeners = new Set<HostPatchListener>();
+
+export function subscribeHostPatch(listener: HostPatchListener): () => void {
+  listeners.add(listener);
+  return () => listeners.delete(listener);
+}
+
+export function emitHostPatch(detail: HostDetail): void {
+  for (const listener of listeners) {
+    listener(detail);
+  }
+}

frontend/src/utils/hostsLiveUpdate.ts

@@ -1,4 +1,5 @@
 import type { HostDetail, HostSummary } from "../api";
+import { isAgentVersionNewer } from "./agentVersion";
 
 /** Обновляет поля строки списка хостов из GET /hosts/{id} (без перезагрузки таблицы). */
 export function patchHostSummaryFromDetail(target: HostSummary, detail: HostDetail): void {
@@ -13,3 +14,14 @@ export function patchHostSummaryFromDetail(target: HostSummary, detail: HostDeta
   target.last_inventory_at = detail.last_inventory_at;
   target.agent_status = detail.agent_status;
 }
+
+export function bumpLatestAgentVersion(
+  latest: Record<string, string> | undefined,
+  product: string,
+  version: string | null | undefined,
+): void {
+  if (!latest || !version) return;
+  if (isAgentVersionNewer(version, latest[product])) {
+    latest[product] = version;
+  }
+}