赵月辉 / fastgpt-migrated

* 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

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Co-authored-by: archer <545436317@qq.com>