Add DMS configuration and helper scripts
- Introduced a new `justfile` for managing DMS-related tasks, including a recipe for syncing live DMS configuration. - Added a `devshell.nix` file to set up a development environment with necessary packages and shell hooks for DMS. - Updated DMS settings to replace `defaultSettingsFile` with `defaultSeedDir` for improved configuration management. - Created a new script `sync-seed.sh` to facilitate syncing DMS settings from the live configuration to host-specific directories. - Enhanced documentation and examples for DMS configuration and usage.
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