- Add LandVerpachtung model with Land and Paechter relationships
- Implement full CRUD operations for Verpachtungen
- Add responsive Bootstrap templates with JavaScript calculations
- Integrate document linking functionality similar to other entities
- Add navigation links and URL patterns
- Include CSV import support for Paechter data
- Fix template encoding issues for proper UTF-8 support
- Enhance administration interface with Verpachtung CSV import
This implements the complete Verpachtung management feature requested,
allowing users to manage land lease agreements with proper relationships
to properties (Laenderei) and tenants (Paechter), following the same
patterns as Foerderung/Destinataer relationships.
- Add dotenv loading to Django settings
- Update CI workflow to use correct environment variables
- Set POSTGRES_* variables instead of DATABASE_URL
- Add environment variables to all Django management commands
- Fixes CI test failures due to database connection issues
