Make session idle timeout configurable via SESSION_LIFETIME env

[level09]

Summary

• PERMANENT_SESSION_LIFETIME is currently hardcoded to 3600s. This makes it configurable via the SESSION_LIFETIME environment variable, defaulting to 3600 (no behavior change for existing installs).
• Lets operators tune the idle session timeout (Flask refreshes the cookie/Redis TTL on every request, so this effectively controls idle expiry) without code changes.

Test plan

• Unset SESSION_LIFETIME → sessions expire after 3600s of inactivity (unchanged default).
• Set SESSION_LIFETIME=300 in .env → sessions expire after 5 min of inactivity.
• Service starts cleanly with the env var present and absent.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch session-lifetime-env

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[apodacaduron]

Simple change works as intended