feat: add catalogue image management (#1)

- Add CatalogueImage model with FK to Product
- Add image resize service (strict/non-strict modes with configurable dimensions)
- Add CRUD API endpoints with admin-only write permissions
- Add catalogue_images field to product listing/detail endpoints
- Serve media files in development via static()
- 28 TDD tests covering model, API, permissions, resize, and product listing

tienda_ilusion/don_confiao/migrations/0049_catalogueimage.py

@@ -0,0 +1,24 @@
+# Generated by Django 5.0.6 on 2026-06-13 18:31
+
+import django.db.models.deletion
+import don_confiao.models.catalogue_images
+from django.db import migrations, models
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ('don_confiao', '0048_catalogsale_customer_address_and_more'),
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='CatalogueImage',
+            fields=[
+                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
+                ('image', models.ImageField(upload_to=don_confiao.models.catalogue_images._catalogue_image_upload_path)),
+                ('uploaded_at', models.DateTimeField(auto_now_add=True)),
+                ('product', models.ForeignKey(on_delete=django.db.models.deletion.CASCADE, related_name='catalogue_images', to='don_confiao.product')),
+            ],
+        ),
+    ]