[Hotfix Main]: feat: add autohooks plugin to sort JSON keys in test ref files

[github-actions]

Hotfix of PR #1936 (#1936) to the main branch.
Hey @benflexcompute, please review this hotfix PR created from your original PR.

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Note

Low Risk
Low risk: dev-tooling-only change that adds an extra pre-commit formatter for tests/**/*.json and updates documentation, with no runtime or production logic impact.

Overview
Adds an autohooks pre-commit step (flow360._autohooks.sort_json) that automatically sorts keys in staged JSON files under tests/ by reusing tools/sort_ref_json.py, then re-stages the updated files.

Updates pyproject.toml to enable the new plugin and refreshes README.md with autohooks activation instructions plus an equivalent manual “check in” command (python tools/sort_ref_json.py).

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