chore(release): [REL-09] prepare independent major versions and verified artifacts

packages/artplayer-plugin-chapter/CHANGELOG.md

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+# Changelog
+
+## 2.0.0 (unreleased)
+
+This independent major version identifies the compatibility modernization. Existing public APIs remain the compatibility target; documented historical differences and release gates still apply.
+
+- Typed parsing, chapter UI and lifecycle integration.
+- Preserve chapter selection/events; remaining restart timing and distribution gates are explicit.
+
+Internal dependencies and public entrypoints retain their documented compatibility boundaries. No new core-major peer restriction is introduced.
+
+Implementation and migration details: [README.md](./README.md), [ARCHITECTURE.md](./ARCHITECTURE.md).
+
+This entry records local preparation. Candidate contents, browser/device evidence and publication still require their release checks.