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* fix(auth): persist auto-generated JWT secret to survive restarts When AUTH_JWT_SECRET is not set, the auto-generated secret is now written to .deer-flow/.jwt_secret (mode 0600) and reused on subsequent starts. This prevents session invalidation on every restart while still allowing explicit AUTH_JWT_SECRET in .env to take precedence. * Apply suggestions from code review Co-authored-by: Copilot Autofix powered by AI <223894421+github-code-quality[bot]@users.noreply.github.com> * Apply suggestions from code review Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com> * fix the lint errors of backend --------- Co-authored-by: Copilot Autofix powered by AI <223894421+github-code-quality[bot]@users.noreply.github.com> Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>