feat(research): add research study management functionality

- Implemented models for ResearchStudy, ResearchStudyArm, and ResearchParticipant.
- Created views for listing, creating, updating, and exporting research studies.
- Added bulk participant generation feature with CSV and JSON support.
- Developed templates for study management, participant entry, and bulk generation.
- Introduced URL routing for research study operations.
- Added utility functions for randomisation and participant assignment.
- Implemented participant intake process with demographic data collection.
- Ensured proper handling of participant CIDs and assignment methods.

atlas/migrations/0103_casecollection_auto_apply_question_template_and_more.py

@@ -0,0 +1,38 @@
+# Generated by Django 6.0.1 on 2026-05-12 20:35
+
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('atlas', '0102_alter_seriesimage_image_blake3_hash_and_more'),
+    ]
+
+    operations = [
+        migrations.AddField(
+            model_name='casecollection',
+            name='auto_apply_question_template',
+            field=models.BooleanField(default=False, help_text='If enabled, the case_question_template is automatically applied to new cases added to this collection that do not have an existing question_schema.'),
+        ),
+        migrations.AddField(
+            model_name='casecollection',
+            name='case_question_max_score',
+            field=models.PositiveIntegerField(blank=True, help_text='Maximum score per case used for normalisation. Defaults to 10 when not set.', null=True),
+        ),
+        migrations.AddField(
+            model_name='casecollection',
+            name='case_question_template',
+            field=models.JSONField(blank=True, help_text='JSON schema applied as a default question template for all cases in this collection. Individual cases can override via CaseDetail.question_schema.', null=True),
+        ),
+        migrations.AddField(
+            model_name='casecollection',
+            name='marking_guidance',
+            field=models.TextField(blank=True, help_text='Plain-language marking guidance displayed to markers.'),
+        ),
+        migrations.AddField(
+            model_name='casecollection',
+            name='marking_scheme_name',
+            field=models.CharField(blank=True, help_text='Human-readable mark scheme name shown to markers and in exports.', max_length=255),
+        ),
+    ]