Updated workflows to use workflow_dispatch instead of pull_request/push:
- backend-foundation.yml: Removed pull_request and push triggers
- mobile-ci.yml: Removed pull_request and push triggers with path filters
- web-quality.yml: Removed pull_request and push triggers
Workflows now only run manually via Actions tab. This gives more control over when CI runs and reduces unnecessary workflow executions.
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.
