docs(SITES-47932): add GET /sites response examples for all three response shapes

Adds named OpenAPI examples for SiteList, SitePagedResponse, and
SiteSearchResponse so the API docs show real response samples in the
dropdown rather than the Redoc-generated empty placeholder.

Also bumps @adobe/spacecat-shared-drs-client 1.13.0 → 1.14.0 to fix
pre-existing type-check failures (listJobs and createBrandPresenceSchedule
were missing from the published DrsClient type definition).

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: habansal