As a developer, I want a reusable library that encapsulates the REST API security currently implemented in swatch-contracts so that all Quarkus services can adopt a consistent, secure, and maintainable API security model with minimal duplication.

Acceptance Criteria

• New shared library published and consumable by other services (swatch-common-security).
• Library is documented with examples in the library's README so it is easily applied to other services.
• Ensure adequate test coverage around security already exists for swatch-contracts and add if necessary.
• Library is applied to swatch-contracts and there are no regressions.