feat(ci): add automated workflows for releases and nightly builds

- Introduce workflows for auto-releases, changelog updates, and nightly builds
- Add scripts for version management, asset uploads, and cleanup tasks
- Remove deprecated GitHub workflow and optimize `.gitignore` entries
- Configure `git-cliff` for enhanced changelog generation with custom rules

.gitignore

@@ -5,3 +5,5 @@ ait.*.config.json
 dist/
 *.spec
 build/
+**/__pycache__
+.gitea/scripts/.env