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/models.py

@@ -0,0 +1,37 @@
+from django.db import models
+
+
+class BoxType(models.Model):
+    """A type of storage box with specific dimensions."""
+
+    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')
+
+    class Meta:
+        ordering = ['name']
+
+    def __str__(self):
+        return self.name
+
+
+class Box(models.Model):
+    """A storage box in the lab."""
+
+    id = models.CharField(
+        max_length=10,
+        primary_key=True,
+        help_text='Alphanumeric identifier (max 10 characters)'
+    )
+    box_type = models.ForeignKey(
+        BoxType,
+        on_delete=models.PROTECT,
+        related_name='boxes'
+    )
+
+    class Meta:
+        verbose_name_plural = 'boxes'
+
+    def __str__(self):
+        return self.id