feat(ingestor): add and configure ingestor

[baumi-an]

Description

Add Ingestor support to this stack, including runtime configuration for local scicat live deployment. This allows enabling the ingestor via environment flags and running it in both standard and DEV modes with backend/frontend integration. By default the Ingestor component is disabled.

Changes

• Add a new ingestor service package under services, including:
  • base compose configuration with dependencies, env settings, Traefik port label, mounted data path, and config injection
  • DEV compose extension and local service env file for source-based development
  • startup entrypoint script that renders environment variables into ingestor runtime config
• Add ingestor configuration to match the local scicat-live deployment
• Include ingestor compose in the root compose include chain when INGESTOR_ENABLED is set Extend root environment docs and examples with:
  • INGESTOR_ENABLED
  • INGESTOR_DATA_DIR
  • INGESTOR_DEV
• Add frontend ingestor feature config and wire it into frontend compose configs
• Document ingestor usage, defaults, dependencies, and optional feature flags in service documentation
• Update frontend image tag in compose base to align with the ingestor integration state in this branch
• Changes checklist

Changes checklist

Modified Service?

• Steps from features in README checked

New Service?

• Steps from new service (advanced) in README checked