support long running session

plus UI reattaching to existing session

ui/src/api.ts

@@ -247,6 +247,10 @@ export function createTerminal(
   });
 }
 
+export function listTerminals(): Promise<TerminalSession[]> {
+  return request<TerminalSession[]>("/api/v1/control/terminals");
+}
+
 export function attachTerminal(terminalId: string): Promise<TerminalSession> {
   return request<TerminalSession>(
     `/api/v1/control/terminals/${encodeURIComponent(terminalId)}/attach`,