feat: Add invoice management menu and template editor for admin

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- Add 'Rechnung' menu with sub-items 'Verwalten' and 'Template' in admin sidebar
- Create InvoiceTemplatePage with drag-and-drop editor for invoice templates
  - Includes invoice-specific elements (header, customer data, issuer info,
    invoice items, totals, payment terms, bank details)
  - Supports PDF preview and download
  - API integration for saving/loading templates (/admin/invoice-template)
- Create InvoiceManagementPage as placeholder for invoice overview
- Add routes for /admin/rechnung/verwalten and /admin/rechnung/template
- Update page titles in AppShell for new routes

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This commit is contained in:

Sven Carstensen

2026-03-16 20:30:45 +01:00

parent cbabe13162

commit eb0f921464

4 changed files with 2408 additions and 0 deletions

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frontend/src/pages/InvoiceTemplatePage.tsx Normal file

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