fix(backend): make pre-tools env vars available in postinstall hooks - #6418

Bugbot Analysis Progress (2m 37s elapsed)

✅ Gathered PR context (2s)
✅ Analyzed code changes (1s)
✅ Completed bug detection — 0 potential bugs found (2m 33s)
✅ Validation and filtering completed (0s)
✅ Posted analysis results — 0 bugs reported (1s)
✅ Analysis completed successfully (0s)

Final Result: Bugbot completed review - no issues found! ✅

Request ID: serverGenReqId_08f78246-0cf8-4f07-bf74-a1cbbaff3f7b