Update to latest engine. Add sync-v2. Various fixes.

src/app.ts

@@ -13,7 +13,7 @@ import { getDataDir } from "./utils/paths.js";
  * Configuration options for the CLI application.
  */
 export interface AppConfig {
-  /** URL of the sync server (default: http://localhost:3000) */
+  /** URL of the sync server (default: https://v2.sync.xo.harvmaster.com) */
   syncServerUrl: string;
   /** Database path for wallet state storage */
   databasePath: string;
@@ -51,7 +51,8 @@ export class App {
     const dataDir = getDataDir();
     // Set default configuration
     const fullConfig: AppConfig = {
-      syncServerUrl: config.syncServerUrl ?? "http://localhost:3000",
+      syncServerUrl:
+        config.syncServerUrl ?? "https://v2.sync.xo.harvmaster.com",
       databasePath: config.databasePath ?? dataDir,
       databaseFilename: config.databaseFilename ?? "xo-wallet.db",
       invitationStoragePath: