Fixed 'invalid character '\x1f' looking for beginning of value' error caused by gzip compression in setupKillcodeHeaders function:
- Removed 'Accept-Encoding: br, gzip, deflate' header that caused upstream to return compressed responses
- Removed browser-specific 'sec-fetch-mode: cors' header
- This prevents new-api from trying to parse compressed JSON as raw text
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Co-Authored-By: Claude <noreply@anthropic.com>
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