Proxy Environment Check and Warning | Generated by AI

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Added warn_if_proxy_set():

• Checks http_proxy, https_proxy, HTTP_PROXY, HTTPS_PROXY, all_proxy, ALL_PROXY.
• If any is set, prints which vars + values, explains hf-mirror.com doesn’t need a proxy, and shows the exact unset command.
• Runs curl -m 5 https://www.google.com (which inherits the user’s proxy env) and reports the HTTP code — 200 means the proxy works but is unneeded; non-200 means it’s probably broken anyway.
• Handles missing curl gracefully (FileNotFoundError).
• Called once at the start of main() before any downloads happen.

Doesn’t abort — just warns, so the user can still proceed if they really want to.

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