Initial commit: Django project with boxes app

- Set up Django 5.2.9 project structure
- Add boxes app with Box and BoxType models
- Box: alphanumeric ID (max 10 chars) with foreign key to BoxType
- BoxType: name and dimensions (width/height/length in mm)
- Configure admin interface for both models
- Add comprehensive test suite (14 tests)

boxes/migrations/0001_initial.py

@@ -0,0 +1,38 @@
+# Generated by Django 5.2.9 on 2025-12-28 12:01
+
+import django.db.models.deletion
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    initial = True
+
+    dependencies = [
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='BoxType',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('name', models.CharField(max_length=255)),
+                ('width', models.PositiveIntegerField(help_text='Width in millimeters')),
+                ('height', models.PositiveIntegerField(help_text='Height in millimeters')),
+                ('length', models.PositiveIntegerField(help_text='Length in millimeters')),
+            ],
+            options={
+                'ordering': ['name'],
+            },
+        ),
+        migrations.CreateModel(
+            name='Box',
+            fields=[
+                ('id', models.CharField(help_text='Alphanumeric identifier (max 10 characters)', max_length=10, primary_key=True, serialize=False)),
+                ('box_type', models.ForeignKey(on_delete=django.db.models.deletion.PROTECT, related_name='boxes', to='boxes.boxtype')),
+            ],
+            options={
+                'verbose_name_plural': 'boxes',
+            },
+        ),
+    ]