Add robust validation for hosts provided through URI or Base64 pairing
strings to prevent Server-Side Request Forgery (SSRF). The application
now rejects loopback addresses (like localhost, 127.0.0.1, 0.0.0.0),
link-local addresses, and any-local addresses, while continuing to allow
remote connections to site-local addresses, custom remote domains,
and VPN networks (like Tailscale). The DNS resolution operates securely
on the IO dispatcher to ensure main-thread safety. Included tests verify
both rejection of invalid hosts and seamless parsing of valid ones.
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