Fix API URL environment variable name mismatch

Robert Szellrequested to merge
dev into stage

Changed NEXT_PUBLIC_API_URL to NEXT_PUBLIC_BACKEND_URL to match the actual environment variable set in .env files. This was causing login to fail in production as it used the fallback localhost URL.

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Co-Authored-By: Claude Opus 4.5 noreply@anthropic.com

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