- Add VierteljahresNachweis model for quarterly document tracking
- Remove studiennachweis_erforderlich field (now always required)
- Fix modal edit view to include studiennachweis section
- Implement automatic DestinataerUnterstuetzung creation when requirements met
- Set payment due dates to exact quarter end dates (Mar 31, Jun 30, Sep 30, Dec 31)
- Add quarterly confirmation CRUD views with modal and full-screen editing
- Update templates with comprehensive quarterly management interface
- Include proper validation, status tracking, and progress indicators
Jan Remmer Siebels
126f68ec68