merge: unify main into master (master content is authoritative)
main was a 4-commit January 2026 orphan snapshot that also committed node_modules/, backend/.env and backend/data/database.db. Its only source features (OSS traffic stats via @alicloud/cms20190101, /s/:code share route, quota display fixes) are all superseded by master's 360-commit history — master implements download traffic via the reservation + OSS log reconcile system instead. Merge records main's history as an ancestor; the resulting tree is master's unchanged.
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