feat: dnevni unosi i svi dani u mjesecnom izvjestaju servisera

- Dodan model MonthlyServicerDayEntry s automatskom popunom prema tipu:
  office (08:00-16:00, Zagreb ured), vacation i sick_leave (8h bez vremena)
- Migracija 0034_monthlyservicerdayentry za novu tablicu s UniqueConstraint
- Novi ViewSet + serializer + endpoint fleet/monthly-servicer-day-entries/
  (upsert: POST za novi dan ili update za isti dan ako vec postoji)
- Backend DOCX report (_build_monthly_servicer_report_rows) sad generira
  redak za SVAKI dan u mjesecu: taskovi > rucni unos > prazan red
- TaskCalendarWidget potpuno prepisan bez mojibake znakova
  (zamjena UTF-8 specijalnih znakova ASCII ekvivalentima u string literalima)
- Tablica izvjestaja servisera: klikom na red bez naloga otvara se overlay
  s tri opcije (Rad u uredu / Bolovanje / Godisnji)
- TaskCalendarPortal: dodan calendarWorkOrders computed (svi statusi)
  kako bi report imao potpune podatke o radnom vremenu
- fetchMonthlyServicerEntries i upsertMonthlyServicerEntry u store-u

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

backend/modules/fleet/urls.py

@@ -3,7 +3,7 @@ from django.urls import path
 from .views import (
     CraneViewSet, VehicleViewSet, WorkOrderViewSet, VehicleServiceRecordViewSet,
     WorkOrderInvoiceViewSet, ServiceContextNoteViewSet, VehicleNotificationViewSet, VehicleServicePhotoViewSet, VehicleServiceAttachmentViewSet, pusher_auth,
-    monthly_servicer_report_docx, monthly_costs_report_docx,
+    monthly_servicer_report_docx, monthly_costs_report_docx, MonthlyServicerDayEntryViewSet,
 )
 
 router = DefaultRouter()
@@ -16,6 +16,7 @@ router.register(r'service-records', VehicleServiceRecordViewSet, basename='servi
 router.register(r'notifications', VehicleNotificationViewSet, basename='vehicle-notification')
 router.register(r'service-photos', VehicleServicePhotoViewSet, basename='service-photo')
 router.register(r'service-attachments', VehicleServiceAttachmentViewSet, basename='service-attachment')
+router.register(r'monthly-servicer-day-entries', MonthlyServicerDayEntryViewSet, basename='monthly-servicer-day-entry')
 
 urlpatterns = router.urls