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/serializers.py

@@ -10,6 +10,7 @@ from .models import (
     Crane,
     Vehicle,
     ServiceContextNote,
+    MonthlyServicerDayEntry,
     VehicleNotification,
     WorkOrder,
     WorkOrderAdditionalCostsTable,
@@ -228,6 +229,35 @@ class ServiceContextNoteCreateSerializer(serializers.Serializer):
             attrs['target_users'] = [target_user]
         return attrs
 
+
+class MonthlyServicerDayEntrySerializer(serializers.ModelSerializer):
+    class Meta:
+        model = MonthlyServicerDayEntry
+        fields = [
+            'id',
+            'entry_date',
+            'entry_type',
+            'description',
+            'location',
+            'start_time',
+            'end_time',
+            'regular_hours',
+            'overtime_hours',
+            'created_at',
+            'updated_at',
+        ]
+        read_only_fields = [
+            'id',
+            'description',
+            'location',
+            'start_time',
+            'end_time',
+            'regular_hours',
+            'overtime_hours',
+            'created_at',
+            'updated_at',
+        ]
+
 class WorkOrderSerializer(serializers.ModelSerializer):
     crane = serializers.SerializerMethodField()
     crane_label = serializers.SerializerMethodField()