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/models.py

@@ -1,5 +1,6 @@
 import uuid
 import re
+from datetime import time
 from django.db import models
 from django.conf import settings
 from django.core.exceptions import ValidationError
@@ -694,4 +695,84 @@ class ServiceContextNote(BaseModel):
             if self.task.work_order_id != self.work_order_id:
                 raise ValidationError({
                     'task': _("Radni zadatak mora biti povezan s istim putnim nalogom kao bilješka."),
-                })
+                })
+
+
+class MonthlyServicerDayEntry(BaseModel):
+    ENTRY_TYPE_CHOICES = [
+        ('office', _('Rad u uredu')),
+        ('sick_leave', _('Bolovanje')),
+        ('vacation', _('Godišnji odmor')),
+    ]
+
+    user = models.ForeignKey(
+        settings.AUTH_USER_MODEL,
+        on_delete=models.CASCADE,
+        related_name='monthly_servicer_day_entries',
+        verbose_name=_('Serviser'),
+    )
+    entry_date = models.DateField(db_index=True, verbose_name=_('Datum'))
+    entry_type = models.CharField(
+        max_length=24,
+        choices=ENTRY_TYPE_CHOICES,
+        verbose_name=_('Vrsta unosa'),
+    )
+    description = models.CharField(max_length=255, blank=True, verbose_name=_('Opis posla'))
+    location = models.CharField(max_length=255, blank=True, verbose_name=_('Mjesto rada'))
+    start_time = models.TimeField(null=True, blank=True, verbose_name=_('Početak rada'))
+    end_time = models.TimeField(null=True, blank=True, verbose_name=_('Kraj rada'))
+    regular_hours = models.DecimalField(
+        max_digits=5,
+        decimal_places=2,
+        default=Decimal('8.00'),
+        verbose_name=_('Redovan rad'),
+    )
+    overtime_hours = models.DecimalField(
+        max_digits=5,
+        decimal_places=2,
+        default=Decimal('0.00'),
+        verbose_name=_('Prekovremeni rad'),
+    )
+
+    class Meta:
+        verbose_name = _('Dnevni unos mjesečnog izvještaja servisera')
+        verbose_name_plural = _('Dnevni unosi mjesečnog izvještaja servisera')
+        ordering = ['entry_date']
+        constraints = [
+            models.UniqueConstraint(
+                fields=['user', 'entry_date', 'is_active'],
+                name='uniq_monthly_servicer_day_entry_user_date_active',
+            ),
+        ]
+
+    def __str__(self):
+        return f"{self.user_id} @ {self.entry_date} ({self.entry_type})"
+
+    def apply_defaults(self):
+        if self.entry_type == 'office':
+            self.description = 'Rad u uredu'
+            self.location = 'Zagreb (ured)'
+            self.start_time = time(8, 0)
+            self.end_time = time(16, 0)
+            self.regular_hours = Decimal('8.00')
+            self.overtime_hours = Decimal('0.00')
+            return
+
+        if self.entry_type == 'vacation':
+            self.description = 'Godišnji odmor'
+        elif self.entry_type == 'sick_leave':
+            self.description = 'Bolovanje'
+
+        self.location = ''
+        self.start_time = None
+        self.end_time = None
+        self.regular_hours = Decimal('8.00')
+        self.overtime_hours = Decimal('0.00')
+
+    def clean(self):
+        super().clean()
+        self.apply_defaults()
+
+    def save(self, *args, **kwargs):
+        self.full_clean()
+        return super().save(*args, **kwargs)