* feat(app): introduce resource reference index and optimize skill appCount query performance * refactor(app): standardize api input validation and optimize backfill performance * fix: tighten skill resource refs backfill * fix: use version resource refs for skill app count * fix: cache skill resource refs on apps * chore: remove unused app version refs index * perf: optimize skill list permission lookup --------- Co-authored-by: archer <545436317@qq.com>
