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/api.ts

@@ -1,4 +1,4 @@
-const TOKEN_KEY = "sac_token";
+const TOKEN_KEY = "sac_token";
 const ROLE_KEY = "sac_role";
 
 export function getToken(): string | null {
@@ -227,6 +227,8 @@ export interface HostSummary {
   last_daily_report_at: string | null;
   last_inventory_at?: string | null;
   agent_status: "online" | "stale" | "unknown";
+  ssh_admin_ok?: boolean | null;
+  ssh_admin_checked_at?: string | null;
 }
 
 export interface HostDetail extends HostSummary {
@@ -474,6 +476,8 @@ export interface HostSshActionResult {
   stdout: string | null;
   stderr: string | null;
   exit_code: number | null;
+  product_version?: string | null;
+  ssh_admin_ok?: boolean | null;
 }
 
 export function testHostSsh(hostId: number): Promise<HostSshActionResult> {