fix: resolve high-severity npm audit vulnerabilities

Run npm audit fix to address:
- fast-xml-builder: attribute value quote bypass (high)
- fast-uri: path traversal via percent-encoded dot segments (high, prod dep)
- uuid: missing buffer bounds check (moderate)

Remaining moderate vulnerabilities are in @aws-sdk transitive deps
(fast-xml-parser < 5.7.0) which require upstream SDK updates.

Author: Hweinstock