docs(dev): update setup guide for PostgreSQL-based local stack
- Updated `.env.example` to default to PostgreSQL, Redis, MinIO, and OpenSearch for local development.
- Enhanced local development guide with updated commands and dependency configurations.
- Detailed fallback to SQLite and lightweight configurations for simpler setups.
- Clarified Docker Compose usage for fully containerized local stacks.
docs: expand file history and batch workflow documentation
- Added details on filename-based file history and grouping rules.
- Documented multi-file batch submission, monitoring, and recovery workflows.
- Clarified comparison functionality and storage backend role in file versioning.
- Introduced startup recovery handling for stale jobs and clarified related behaviors.
