fix: use HTTP_TIMEOUT constant instead of magic number (#92)

* feat: add retry logic and extended timeouts for large file downloads

- Add automatic retry mechanism with exponential backoff (3 retries max)
- Implement automatic resume on retry by re-checking file size
- Extend connection timeout to 10 minutes for large file downloads
- Add connection pooling and TCP keepalive settings
- Refactor download_file_content to handle transient network errors
- Simplify function signature by removing explicit file_size parameter

Addresses issues:
- #76: Large files downloading with incorrect size/hash errors
- #89: Connection errors during download ('error decoding response body')

Changes from PR #86 by @ApfelTeeSaft

* fix: use HTTP_TIMEOUT constant instead of magic number

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Co-authored-by: Martin Wimpress <martin@wimpress.org>
Co-authored-by: cubic-dev-ai[bot] <1082092+cubic-dev-ai[bot]@users.noreply.github.com>

Author: 3 people