merge(reconcile/upstream dcbffb08)

[rdiperri-wasabi]

Type of Change

• New Feature
• Bug Fix
• Documentation
• Performance Improvement
• Test/CI
• Refactor
• Other:

Related Issues

Summary of Changes

Reconciles 405 upstream commits
see https://github.com/wasabi/rdiperri-rustfs-fork-diff for details of resolutions

Notable upstream changes in this range:

• Full async xlmeta I/O: write_xlmeta converted from spawn_blocking to
  native tokio::fs::File::write_all().await (a9e62dc2, a8a5f25a).
• Lock, lifecycle, replication, IAM, and KMS updates across 405 commits.
  Post-merge compilation fixes (8b6c964e):
• S3VersionId/Uuid wrapping in filemeta, object_usecase, ecfs,
  lifecycle, replication.
• ConnPoolEntry test fixture update in remote_disk.
• ObjectLockRequest new-field defaults in fast_lock tests.
• rustfmt indentation in set_disk.
• Perf script updates: RPC secret wiring, -v4 loadgen flag.
  iopool experiment (1b1c868c, reverted 447c610e):
  An xlmeta per-disk io_uring runtime experiment was committed and immediately
  reverted. The revert is preserved in history for traceability. Post-merge
  perf investigation confirmed the optimization provides no throughput benefit
  on the merged binary: the pre-merge gain depended on spawn_blocking
  isolation (Effect 2), which this upstream range correctly removed. All
  investigated levers (ring isolation, op-count reduction, CBW parallelism)
  were net-zero or net-negative on the merged binary at 8d/100t.

Checklist

• I have read and followed the CONTRIBUTING.md guidelines
• Passed make pre-commit
• Added/updated necessary tests
• Documentation updated (if needed)
• CI/CD passed (if applicable)

Impact

• Breaking change (compatibility)
• Requires doc/config/deployment update
• Other impact:

Additional Notes

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