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>

shared/infrastructure/factory.py

@@ -12,7 +12,7 @@ from shared.config import init_config, config, pretty
 from shared.models import KV  # ensure shared models imported
 # Register all app model classes with SQLAlchemy so cross-domain
 # relationship() string references resolve correctly.
-for _mod in ("blog.models", "market.models", "cart.models", "events.models", "federation.models", "account.models"):
+for _mod in ("blog.models", "market.models", "cart.models", "events.models", "federation.models", "account.models", "relations.models", "likes.models", "orders.models"):
     try:
         __import__(_mod)
     except ImportError:

shared/infrastructure/urls.py

@@ -41,6 +41,10 @@ def federation_url(path: str = "/") -> str:
     return app_url("federation", path)
 
 
+def orders_url(path: str = "/") -> str:
+    return app_url("orders", path)
+
+
 def account_url(path: str = "/") -> str:
     return app_url("account", path)