1e0959b077
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Add defaultCheckRedirect to both GitHub and Gitea clients that rejects: - HTTPS→HTTP protocol downgrades (prevents plaintext leakage) - Cross-host redirects entirely (prevents consuming untrusted responses) Same-host, same-or-upgraded-scheme redirects remain allowed. Both NewClient constructors wire the policy, and SetHTTPClient(nil) restores it. Callers providing a non-nil client are responsible for configuring their own safe redirect policy. Closes #95