Fix: Gør e-conomic product number konfigurerbar

BUG FIX:
- Hardcoded 'TIME001' eksisterer ikke i e-conomic
- Tilføjet TIMETRACKING_ECONOMIC_PRODUCT setting (default: '1000')
- Produkt nummer kan nu ændres via .env
- Fejl: Product 'TIME001' not found

LØSNING:
Tilføj til .env: TIMETRACKING_ECONOMIC_PRODUCT=XXXX
hvor XXXX er dit produkt nummer for konsulentimer i e-conomic

app/core/config.py

@@ -88,6 +88,7 @@ class Settings(BaseSettings):
     TIMETRACKING_ECONOMIC_DRY_RUN: bool = True
     TIMETRACKING_EXPORT_TYPE: str = "draft"  # "draft" or "booked"
     TIMETRACKING_ECONOMIC_LAYOUT: int = 19  # e-conomic invoice layout number (default: 19 = Danish standard)
+    TIMETRACKING_ECONOMIC_PRODUCT: str = "1000"  # e-conomic product number for time entries (default: 1000)
     
     # Simply-CRM (Old vTiger On-Premise)
     OLD_VTIGER_URL: str = ""

app/timetracking/backend/economic_export.py

@@ -318,7 +318,7 @@ class EconomicExportService:
                     "quantity": hours,
                     "unitNetPrice": price,
                     "product": {
-                        "productNumber": line.get('product_number') or 'TIME001'  # Default til Konsulenttime
+                        "productNumber": line.get('product_number') or settings.TIMETRACKING_ECONOMIC_PRODUCT
                     },
                     "unit": {
                         "unitNumber": 2  # timer (unit 2 in e-conomic)