Major refactor of commerce and Stripe integration

Refactored commerce models to support refunds, invoices, and improved carrier/payment logic. Added new serializers and viewsets for products, categories, images, discount codes, and refunds. Introduced Stripe client integration and removed legacy Stripe admin/model code. Updated Dockerfile for PDF generation dependencies. Removed obsolete migration files and updated configuration app initialization. Added invoice template and tasks for order cleanup.

backend/thirdparty/stripe/migrations/0001_initial.py

@@ -1,26 +0,0 @@
-# Generated by Django 5.2.7 on 2025-10-28 22:28
-
-from django.db import migrations, models
-
-
-class Migration(migrations.Migration):
-
-    initial = True
-
-    dependencies = [
-    ]
-
-    operations = [
-        migrations.CreateModel(
-            name='Order',
-            fields=[
-                ('id', models.BigAutoField(auto_created=True, primary_key=True, serialize=False, verbose_name='ID')),
-                ('amount', models.DecimalField(decimal_places=2, max_digits=10)),
-                ('currency', models.CharField(default='czk', max_length=10)),
-                ('status', models.CharField(choices=[('pending', 'Pending'), ('paid', 'Paid'), ('failed', 'Failed'), ('cancelled', 'Cancelled')], default='pending', max_length=20)),
-                ('stripe_session_id', models.CharField(blank=True, max_length=255, null=True)),
-                ('stripe_payment_intent', models.CharField(blank=True, max_length=255, null=True)),
-                ('created_at', models.DateTimeField(auto_now_add=True)),
-            ],
-        ),
-    ]