Review: release workflow lowercase Docker image names

[Copilot]

github.repository_owner can contain uppercase letters (e.g., SimpleNotificationSystem), producing invalid ghcr.io image names in release notes since Docker registry names must be lowercase.

Changes

• release.yml: Derive OWNER_LOWER via tr '[:upper:]' '[:lower:]' and use it to construct CORE_IMAGE/DASHBOARD_IMAGE shell variables, replacing inline ${{ env.CORE_IMAGE_NAME }}/${{ env.DASHBOARD_IMAGE_NAME }} expressions in the release notes Docker section

OWNER_LOWER=$(echo "${{ github.repository_owner }}" | tr '[:upper:]' '[:lower:]')
CORE_IMAGE="${{ env.REGISTRY }}/${OWNER_LOWER}/simplens-core"
DASHBOARD_IMAGE="${{ env.REGISTRY }}/${OWNER_LOWER}/simplens-dashboard"

build-and-push.yml is unaffected — docker/metadata-action@v5 handles lowercase conversion automatically during image push.

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