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>

events/Dockerfile

@@ -37,6 +37,12 @@ COPY federation/__init__.py ./federation/__init__.py
 COPY federation/models/ ./federation/models/
 COPY account/__init__.py ./account/__init__.py
 COPY account/models/ ./account/models/
+COPY relations/__init__.py ./relations/__init__.py
+COPY relations/models/ ./relations/models/
+COPY likes/__init__.py ./likes/__init__.py
+COPY likes/models/ ./likes/models/
+COPY orders/__init__.py ./orders/__init__.py
+COPY orders/models/ ./orders/models/
 
 # ---------- Runtime setup ----------
 COPY events/entrypoint.sh /usr/local/bin/entrypoint.sh

events/bp/calendars/services/calendars.py

@@ -71,7 +71,7 @@ async def soft_delete(sess: AsyncSession, post_slug: str, calendar_slug: str) ->
 
     cal.deleted_at = utcnow()
     await sess.flush()
-    await call_action("cart", "detach-child", payload={
+    await call_action("relations", "detach-child", payload={
         "parent_type": "page", "parent_id": cal.container_id,
         "child_type": "calendar", "child_id": cal.id,
     })
@@ -108,7 +108,7 @@ async def create_calendar(sess: AsyncSession, post_id: int, name: str) -> Calend
         if existing.deleted_at is not None:
             existing.deleted_at = None  # revive
             await sess.flush()
-            await call_action("cart", "attach-child", payload={
+            await call_action("relations", "attach-child", payload={
                 "parent_type": "page", "parent_id": post_id,
                 "child_type": "calendar", "child_id": existing.id,
             })
@@ -118,7 +118,7 @@ async def create_calendar(sess: AsyncSession, post_id: int, name: str) -> Calend
     cal = Calendar(container_type="page", container_id=post_id, name=name, slug=slug)
     sess.add(cal)
     await sess.flush()
-    await call_action("cart", "attach-child", payload={
+    await call_action("relations", "attach-child", payload={
         "parent_type": "page", "parent_id": post_id,
         "child_type": "calendar", "child_id": cal.id,
     })