Backend verification and contract security: On-chain market validation, error code snapshots, emergency drain constraints - #1505

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package-lock.json is out of sync with package.json. Run 'npm install --package-lock-only' in backend/ with npm 10 and commit the result.

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v4, actions/setup-node@v4, actions/upload-artifact@v4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

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