LibertyXrefType: convert to instance class; fix cross-guid xref join

- Remove extends LibertyBase (unused — all methods were static, no instance
  state needed from the hierarchy)
- Add constructor(contentTypeGuid, packageGuid) so the type context is held
  on the object rather than threaded through every call
- Runtime methods (getDisplayGroups, getTypeMarkers, getAvailableItems,
  getTemplateFormats, getContentTypeMarkers) become instance methods; guid
  params removed
- Admin cross-type queries (getXrefTypeList, getContentTypeGuids, getGroupList)
  stay static
- Fix getAvailableItems JOIN: use t.content_type_guid = s.content_type_guid
  so each item only joins its own group — prevents cross-matching when two
  guids share an x_group name (e.g. 'quantity' on stockcomponent vs stockassembly)
- packageGuid IN() filter applied only in WHERE on s, not duplicated in JOIN

LibertyContent: use LibertyXrefType instance via lazy xrefType() accessor

- Add mXrefType property (reset to null in registerContentType)
- Private xrefType() creates LibertyXrefType(mContentTypeGuid, mPackageGuid)
  on first call and caches it
- Five delegate methods simplified to single-line instance calls

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

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