feat: RDG session flap rule, qwinsta/logoff queue and dashboard UI (0.9.13)

Detect 302→303 within 1–10s, Problem with 30s dedup, rdg_flap flag.
Agent command poll API, admin qwinsta/logoff from Overview. Migration 016.

frontend/src/api.ts

@@ -169,6 +169,34 @@ export interface EventSummary {
   title: string;
   summary: string;
   actor_user?: string | null;
+  rdg_flap?: boolean;
+}
+
+export interface AgentCommandResponse {
+  command_uuid: string;
+  command_type: string;
+  status: string;
+  result_stdout?: string | null;
+  result_stderr?: string | null;
+  created_at?: string | null;
+  completed_at?: string | null;
+}
+
+export function postEventQwinsta(eventId: number): Promise<AgentCommandResponse> {
+  return apiFetch<AgentCommandResponse>(`/api/v1/events/${eventId}/actions/qwinsta`, {
+    method: "POST",
+  });
+}
+
+export function postEventLogoff(eventId: number, sessionId: number): Promise<AgentCommandResponse> {
+  return apiFetch<AgentCommandResponse>(`/api/v1/events/${eventId}/actions/logoff`, {
+    method: "POST",
+    body: JSON.stringify({ session_id: sessionId }),
+  });
+}
+
+export function fetchEventAction(eventId: number, commandUuid: string): Promise<AgentCommandResponse> {
+  return apiFetch<AgentCommandResponse>(`/api/v1/events/${eventId}/actions/${commandUuid}`);
 }
 
 export interface EventListResponse {