feat: dodaj DOCX akcije i napomene na racunima

- dodaje DOCX preuzimanje za putni nalog, servisne zapise i racune na /putni-nalozi/racuni\n- uvodi modal za uredjivanje teksta napomene izvjestaja servisera\n- poboljsava update work order toka i upsert lokalnog stanja\n- ukljucuje TaskCalendar migraciju, dev watch stabilizaciju i deploy upute

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

backend/modules/task_management/migrations/0011_taskcalendar.py

@@ -0,0 +1,26 @@
+# Generated by Django 5.2.15 on 2026-07-21 11:51
+
+from django.db import migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('task_management', '0010_alter_tasktemplate_status'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='TaskCalendar',
+            fields=[
+            ],
+            options={
+                'verbose_name': 'Kalendar zadatka',
+                'verbose_name_plural': 'Kalendar zadataka',
+                'proxy': True,
+                'indexes': [],
+                'constraints': [],
+            },
+            bases=('task_management.task',),
+        ),
+    ]