Split cart into 4 microservices: relations, likes, orders, page-config→blog

Phase 1 - Relations service (internal): owns ContainerRelation, exposes
get-children data + attach/detach-child actions. Retargeted events, blog,
market callers from cart to relations.

Phase 2 - Likes service (internal): unified Like model replaces ProductLike
and PostLike with generic target_type/target_slug/target_id. Exposes
is-liked, liked-slugs, liked-ids data + toggle action.

Phase 3 - PageConfig → blog: moved ownership to blog with direct DB queries,
removed proxy endpoints from cart.

Phase 4 - Orders service (public): owns Order/OrderItem + SumUp checkout
flow. Cart checkout now delegates to orders via create-order action.
Webhook/return routes and reconciliation moved to orders.

Phase 5 - Infrastructure: docker-compose, deploy.sh, Dockerfiles updated
for all 3 new services. Added orders_url helper and factory model imports.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

cart/alembic/env.py

@@ -3,13 +3,10 @@ from shared.db.alembic_env import run_alembic
 
 MODELS = [
     "shared.models.market",       # CartItem lives here
-    "shared.models.order",
-    "shared.models.page_config",
-    "shared.models.container_relation",
 ]
 
 TABLES = frozenset({
-    "cart_items", "orders", "order_items", "page_configs", "container_relations",
+    "cart_items",
 })
 
 run_alembic(context.config, MODELS, TABLES)