feat(sprint8): Phase 2 — Treasury frontend + PDF receipts
Backend:
- ReceiptPdfService: Generates Quittung PDF per payment (OpenPDF, A4)
- FinancialReportService: Annual financial report PDF (Jahresabschluss)
- FinanceController: Added receipt download, annual report, CSV export endpoints
- Portal receipt download with member ownership verification
Frontend:
- src/services/finance.ts: Complete React Query service (types, hooks, mutations)
- /finance: Dashboard with KPI cards, recent transactions, outstanding members
- /finance/payments: Payment list with filtering, void, receipt download
- /finance/kassenbuch: Kassenbuch ledger with date range, CSV export
- /finance/fee-schedules: Fee schedule CRUD with interval management
- /finance/reports: Annual report PDF download
- /portal/finance: Member self-service balance + payment history + receipts
Navigation & i18n:
- Added Finanzen (Wallet icon) to admin sidebar
- Portal finance page for member payments
- Comprehensive de.json + en.json finance keys (~100 translations)
Patrick Plate
3211ade5be