feat: Windows admin in Settings UI and WinRM host test (0.10.1)

Store domain admin in ui_settings (DB overrides env); qwinsta/logoff use effective config.
Host card: POST /hosts/{id}/actions/winrm-test via pywinrm.

frontend/src/api.ts

@@ -412,6 +412,40 @@ export function testMobileDevicePush(deviceId: number): Promise<{ message: strin
   return apiFetch(`/api/v1/mobile/devices/${deviceId}/test-push`, { method: "POST" });
 }
 
+export interface WinAdminSettings {
+  configured: boolean;
+  user: string | null;
+  password_hint: string | null;
+  source: string;
+}
+
+export function fetchWinAdminSettings(): Promise<WinAdminSettings> {
+  return apiFetch<WinAdminSettings>("/api/v1/settings/win-admin");
+}
+
+export function updateWinAdminSettings(payload: {
+  user?: string | null;
+  password?: string | null;
+}): Promise<WinAdminSettings> {
+  return apiFetch<WinAdminSettings>("/api/v1/settings/win-admin", {
+    method: "PUT",
+    body: JSON.stringify(payload),
+  });
+}
+
+export interface HostWinRmTestResult {
+  ok: boolean;
+  message: string;
+  target: string;
+  hostname: string | null;
+}
+
+export function testHostWinRm(hostId: number): Promise<HostWinRmTestResult> {
+  return apiFetch<HostWinRmTestResult>(`/api/v1/hosts/${hostId}/actions/winrm-test`, {
+    method: "POST",
+  });
+}
+
 export interface DashboardSummary {
   events_last_24h: number;
   hosts_total: number;