This updates ngclient to 225, and also adds `--duplicati-webservice-suppress-welcome-page` to automatically disable the welcome page that is shown on new installs.
Treat auth refresh responses 400, 401, and 415 as terminal authentication failures
Clear stale auth state and refresh nonce, then immediately redirect to /login.html
Stop reconnect countdown/retry when terminal refresh failure is detected
Preserve normal retry behavior for transient failures such as 503
Add Playwright regression tests covering:
415 refresh failure redirects to login without runaway retries
503 refresh failure keeps retry behavior and does not force login redirect
Kenneth Skovhede