feat: manual host add from Hosts list via WinRM/SSH (0.4.5)

Add host button probes Windows by hostname or Linux by IP, registers host in SAC and deploys agent in background.

Co-authored-by: Cursor <cursoragent@cursor.com>

frontend/src/api.ts

@@ -575,6 +575,18 @@ export function runHostAgentUpdateFallback(hostId: number): Promise<HostRemoteAc
   );
 }
 
+export interface HostManualAddRequest {
+  platform: "windows" | "linux";
+  target: string;
+}
+
+export function addHostManually(body: HostManualAddRequest): Promise<HostRemoteActionStartResult> {
+  return apiFetch<HostRemoteActionStartResult>("/api/v1/hosts/manual-add", {
+    method: "POST",
+    body: JSON.stringify(body),
+  });
+}
+
 export function fetchHostRemoteJob(hostId: number): Promise<HostRemoteActionJobStatus> {
   return apiFetch<HostRemoteActionJobStatus>(`/api/v1/hosts/${hostId}/actions/remote-job`);
 }