Re-resolve custom DNS on cross-host redirects

[ryanfowler]

Summary

• Rebuild the reqwest client when a manual redirect changes scheme, host, or port so custom DNS resolution is refreshed for the new target.
• Keep -vvv DNS logging and --timing aligned with the active redirect destination instead of the original URL.
• Add an integration test that redirects from host A to host B and verifies both are resolved through the configured UDP DNS server.

Testing

• cargo fmt
• cargo clippy --locked --all-targets --all-features -- -D warnings
• cargo test --all-features
• cargo test --all-features --test integration -- --test-threads=1
• Focused regression test for the new cross-host redirect DNS case passed.