feat: add support package upload feature with files-sdk 0.3.1

- Update files-sdk dependency from local path to crates.io version 0.3.1
- Add support package upload functionality to Files.com
- Implement --upload and --no-save flags for support package commands
- Support cluster, database, and node support package uploads
- Add environment variable support for Files.com API key
- All existing functionality preserved and tests passing

Author: joshrotenberg