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/models/__init__.py

@@ -10,11 +10,11 @@ from .ghost_membership_entities import (
     GhostNewsletter, UserNewsletter,
     GhostTier, GhostSubscription,
 )
-from .ghost_content import Tag, Post, Author, PostAuthor, PostTag, PostLike
+from .ghost_content import Tag, Post, Author, PostAuthor, PostTag
 from .page_config import PageConfig
 from .order import Order, OrderItem
 from .market import (
-    Product, ProductLike, ProductImage, ProductSection,
+    Product, ProductImage, ProductSection,
     NavTop, NavSub, Listing, ListingItem,
     LinkError, LinkExternal, SubcategoryRedirect, ProductLog,
     ProductLabel, ProductSticker, ProductAttribute, ProductNutrition, ProductAllergen,