feat: dodaj prefill email potpisa i body logging

Uvodi signature polje i default predlozak potpisa za nove korisnike, te data migraciju koja popunjava postojece prazne potpise. Email flow sada dosljedno dodaje korisnicki potpis i sprema finalni body poruke u dispatch log radi audita.\n\nCo-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

backend/modules/fleet/email_utils.py

@@ -0,0 +1,17 @@
+def append_user_signature(body, user):
+    body_text = str(body or '').strip()
+    if user is None:
+        return body_text
+
+    signature = ''
+    get_signature = getattr(user, 'get_email_signature', None)
+    if callable(get_signature):
+        signature = str(get_signature() or '').strip()
+    else:
+        signature = str(getattr(user, 'signature', '') or '').strip()
+
+    if not signature:
+        return body_text
+    if not body_text:
+        return signature
+    return f"{body_text}\n\n{signature}"

backend/modules/fleet/tasks.py

@@ -29,6 +29,7 @@ from reportlab.lib.utils import ImageReader
 from reportlab.pdfgen import canvas
 from .models import VehicleNotification, GeneratedWorkOrderPdf
 from .pdf_layout import register_unicode_fonts, draw_standard_header_footer
+from .email_utils import append_user_signature
 
 logger = logging.getLogger(__name__)
 register_unicode_fonts()
@@ -435,7 +436,7 @@ def send_work_order_email_bundle_task(
 
     email_message = EmailMessage(
         subject=subject or f"Putni nalog {_work_order_display_code(work_order)}",
-        body="\n".join(body_lines).strip(),
+        body=append_user_signature("\n".join(body_lines).strip(), requested_by),
         from_email=from_email,
         to=recipients or [],
     )
@@ -450,7 +451,8 @@ def send_work_order_email_bundle_task(
             }
             for filename, content, content_type in attachments
         ]
-        dispatch_log.save(update_fields=['attachments', 'updated_at'])
+        dispatch_log.message = email_message.body
+        dispatch_log.save(update_fields=['attachments', 'message', 'updated_at'])
 
     try:
         email_message.send(fail_silently=False)

backend/modules/fleet/tests/test_work_order_email_task_cached_pdfs.py

@@ -1,6 +1,7 @@
 from unittest.mock import patch
 
 from django.contrib.auth import get_user_model
+from django.core import mail
 from django.test import TestCase, override_settings
 
 from modules.fleet.models import GeneratedWorkOrderPdf, Vehicle, VehicleNotification, WorkOrder
@@ -58,3 +59,25 @@ class WorkOrderEmailTaskCachedPdfTests(TestCase):
         cached_pdfs = notif.metadata.get('cached_pdfs') if isinstance(notif.metadata, dict) else None
         self.assertTrue(isinstance(cached_pdfs, list) and len(cached_pdfs) > 0)
         self.assertIn('download_url', cached_pdfs[0])
+
+    def test_success_email_appends_requester_signature(self):
+        mail.outbox.clear()
+
+        result = send_work_order_email_bundle_task(
+            work_order_id=str(self.work_order.pk),
+            requested_by_id=str(self.user.pk),
+            recipients=['client@example.test'],
+            message='Test poruka bez potpisa.',
+            include_work_order_pdf=True,
+            include_service_records_pdf=False,
+            include_invoices_pdf=False,
+            include_images=False,
+            include_monthly_tasks=False,
+        )
+
+        self.assertEqual(result.get('status'), 'ok')
+        self.assertEqual(len(mail.outbox), 1)
+        sent_body = mail.outbox[0].body
+        self.assertIn('Test poruka bez potpisa.', sent_body)
+        self.assertIn('S poštovanjem / Freundliche Grüße / Kind regards', sent_body)
+        self.assertIn(self.user.email, sent_body)

backend/modules/fleet/views.py

@@ -30,6 +30,7 @@ from reportlab.lib.styles import getSampleStyleSheet
 from reportlab.pdfgen import canvas
 from reportlab.platypus import Table, TableStyle, Paragraph
 from .pdf_layout import register_unicode_fonts, draw_standard_header_footer
+from .email_utils import append_user_signature
 from rest_framework import viewsets, permissions, status, mixins
 from rest_framework.decorators import action, api_view, permission_classes
 from rest_framework.response import Response
@@ -2203,10 +2204,11 @@ class VehicleServiceRecordViewSet(viewsets.ModelViewSet):
         body = _first_non_empty(request.data.get('message')) or (
             f"U prilogu je PDF servisnog zapisa. Poslano {timezone.now().strftime('%d.%m.%Y %H:%M')}."
         )
+        body_with_signature = append_user_signature(body, request.user)
         _send_document_email(
             recipient=recipient,
             subject=subject,
-            body=body,
+            body=body_with_signature,
             filename=f"{service_record.pk}.service-record.pdf",
             pdf_bytes=pdf_bytes,
         )
@@ -2216,7 +2218,7 @@ class VehicleServiceRecordViewSet(viewsets.ModelViewSet):
             service_record=service_record,
             recipients=[recipient],
             subject=subject,
-            message=body,
+            message=body_with_signature,
             attachments=[{'type': 'service_record_pdf', 'filename': f"{service_record.pk}.service-record.pdf"}],
             status='sent',
             sent_at=timezone.now(),