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/admin.py

@@ -1,23 +1,2 @@
 from django.contrib import admin
-from .models import Order
 
-@admin.register(Order)
-class OrderAdmin(admin.ModelAdmin):
-    list_display = ("id", "amount", "currency", "status", "created_at")
-    list_filter = ("status", "currency", "created_at")
-    search_fields = ("id", "stripe_session_id", "stripe_payment_intent")
-    readonly_fields = ("created_at", "stripe_session_id", "stripe_payment_intent")
-
-    fieldsets = (
-        (None, {
-            "fields": ("amount", "currency", "status")
-        }),
-        ("Stripe info", {
-            "fields": ("stripe_session_id", "stripe_payment_intent"),
-            "classes": ("collapse",),
-        }),
-        ("Metadata", {
-            "fields": ("created_at",),
-        }),
-    )
-    ordering = ("-created_at",)