Add missing security schemes to API YAML

[benhepworth]

Summary

The security sections are entirely missing from code/API_definitions/session-insights.yaml. This is a critical issue that blocked the Fall25 release.

Changes Required

• Add securitySchemes to the components section
• Add a security field to each path operation
• Add security on the sink definition, aligned to Commonalities

Mandatory Template

The info.description must also include the mandatory Authorization Template from ICM:
https://github.com/camaraproject/IdentityAndConsentManagement/blob/main/documentation/CAMARA-API-access-and-user-consent.md#mandatory-template-for-infodescription-in-camara-api-specs

References

• Raised as a critical/blocking issue during review of PR r1.1 M3 release #55
• Commonalities r3.2: https://github.com/camaraproject/Commonalities/releases/tag/r3.2