Runs a loopback forwarder per region-named profile (unshackle-<region>), so
--proxy and --proxy-download can exit in different countries
Thanks to Orni_ for the original code and the test account.
Co-authored-by: AntCardFr <24798811+AntCardFR@users.noreply.github.com>
Manifest, licence and auth stay on --proxy; track, subtitle and attachment downloads use the second proxy. Also exposed as proxy_download on the REST download job with the same server_proxy gate. The download session now ignores HTTP(S)_PROXY and copies rnet cookies set by name.
A dead proxy, or one that exits from this machine's IP, now fails with INVALID_PROXY instead of retrying every request; remote session create also builds the service off the event loop so a stuck check cannot block the server.
Swap cookie/PKCE auth for the OAuth 2.0 device authorization grant with a cached rotating refresh token. Fix the connection-token key (`cat`) and move the cache to {cache}/vpn/ to match ProtonVPN.
BREAKING CHANGE: cookie-file auth removed; run once with `enable: true` to approve a device code.
