feat(rc-versioning)!: add version-aware object operations

[cxymds]

Related issue

• Closes rustfs/backlog#1368.
• Replaces feat(rc-versioning)!: add version-aware object operations #270, which GitHub closed after its stacked base branch was deleted.

Background and user impact

RustFS supports version-aware object reads, inspection, copy, listing, and deletion, but the CLI did not provide a consistent contract for selecting exact versions or preserving partial multi-version deletion results. Version-aware JSON also used legacy command-specific shapes, and authorization failures could be misclassified when status metadata was available.

Solution

• Add exact-version support to cat, head, stat, cp, and rm.
• Add recursive rm --versions, including pagination, delete markers, partial-success retention, and explicit governance bypass.
• Keep RustFS force-delete semantics isolated to the existing purge workflow.
• Add safe ObjectStore defaults and structured S3 error mapping for version-specific behavior.
• Add output v3 versioned_objects records for stat, copy, removal, dry-run, and partial failure results.
• Preserve all current main behavior, including transfer, mirror, watch, ops, replication, and purge workflows.

BREAKING change and migration

BREAKING: JSON produced by stat --version-id, rm --version-id, rm --versions, and cp when version identifiers are returned now uses the output schema v3 versioned_objects envelope. Unversioned command output remains unchanged, and output v1/v2 schemas are unchanged. Consumers should dispatch on schema_version, read results under data, and use data.planned for dry-run removals.

Validation

• cargo fmt --all --check
• cargo clippy --workspace -- -D warnings
• cargo test --workspace
• Focused exact-version, versioned-delete, versioned-object, mirror planner, and mirror command tests
• git diff --check and conflict-marker audit

All checks pass with zero failures.