Deepchat Release

Automates the full release cycle for the DeepChat repository, from bumping versions and maintaining bilingual changelogs to creating release branches, running format and lint checks, and fast-forwarding main without merge commits. It enforces the project's specific workflow where dev is the integration branch and release branches are disposable pointers to commits already on dev. Handles recovery scenarios like updating an existing release branch when you fix the changelog after cutting it. The bilingual requirement is a nice touch: English bullets first, Chinese second, starting from v1.0.1. If you maintain a project with a strict Git flow and repeatable release steps, this is the kind of automation that prevents you from forgetting the typecheck or force-pushing the wrong branch at 11pm.