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/admin.py

@@ -0,0 +1,20 @@
+from django.contrib import admin
+
+from .models import Box, BoxType
+
+
+@admin.register(BoxType)
+class BoxTypeAdmin(admin.ModelAdmin):
+    """Admin configuration for BoxType model."""
+
+    list_display = ('name', 'width', 'height', 'length')
+    search_fields = ('name',)
+
+
+@admin.register(Box)
+class BoxAdmin(admin.ModelAdmin):
+    """Admin configuration for Box model."""
+
+    list_display = ('id', 'box_type')
+    list_filter = ('box_type',)
+    search_fields = ('id',)