Updates go.mod and go.sum files across all workspace modules
after adding oasdiff and kin-openapi dependencies for SDK generation.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Move Go module from github.com/Snider/Core to github.com/host-uk/core
to match the new repository location under the host-uk organization.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>