fix(security): harden SSO domain registration, webhook path isolation, and CSV export #4813

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

Request ID: serverGenReqId_9b0ac431-09e0-4c06-ae9b-88a27e9b5590

✅ Bugbot reviewed your changes and found no new issues!

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^{Reviewed by Cursor Bugbot for commit 9119b6a. Configure here.}