Add CI/CD and release automation assets: new GitHub Actions workflows (backend-foundation, hotfix-branch-creation, mobile-ci, product-release, web-quality), shell scripts for version/tag/release-note extraction and release-summary generation (.github/scripts/*), and a Pull Request template. Implements hotfix branch creation from tags, automatic tag name generation, version extraction from pubspec.yaml, CHANGELOG-based release notes extraction, selective mobile CI (detects changed files, builds and lints only affected Dart files), backend service test dry-runs, and automated GitHub release creation with summaries.
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