Automated AI Code Pull Request Review

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        "pr_body": "This PR replaces the legacy session-based authentication with a more scalable JWT implementation. It includes new helper functions for token verification and updates the login route to issue tokens.",
        "pr_title": "Refactor authentication middleware to use JWT",
        "diff_summary": "Modified: src/middleware/auth.js, src/routes/user.js. Added: src/utils/jwt_helper.js. Removed: src/middleware/session_store.js. Total changes: +142, -85 lines."
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