DifyCli and AppAssets used hardcoded absolute paths under /tmp/.dify/,
causing concurrent sandbox sessions on the same host (e.g. SSH provider)
to overwrite each other's config files and CLI binaries.
- Add Sandbox.id property (uuid4 hex) as a stable, path-safe identifier
independent of provider-specific environment IDs
- Convert DifyCli/AppAssets from static constants to per-sandbox instances
namespaced under /tmp/.dify/{sandbox.id}/
- Replace all vm.metadata.id references with sandbox.id
- Replace upload_file with heredoc-based pipeline step in session.py to
reduce round-trips
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