Fix Shell terminal origin checks behind reverse proxies - #1999
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The terminal rejects the public site origin when a reverse proxy replaces Host with its upstream address. Match the operator-configured public origin, consistent with the browser write gate. Do not trust arbitrary forwarded hosts; retain strict scheme, port, origin-shape, session and CSRF checks.
Validation: Shell tests pass, including rewritten Host and foreign-origin rejection. The live signed-in terminal could not be exercised from this browser.