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>

blog/bp/post/services/post_operations.py

@@ -1,58 +0,0 @@
-from __future__ import annotations
-
-from typing import Optional
-
-from sqlalchemy import select, func, update
-from sqlalchemy.ext.asyncio import AsyncSession
-
-from models.ghost_content import Post, PostLike
-
-
-async def toggle_post_like(
-    session: AsyncSession,
-    user_id: int,
-    post_id: int,
-) -> tuple[bool, Optional[str]]:
-    """
-    Toggle a post like for a given user using soft deletes.
-    Returns (liked_state, error_message).
-    - If error_message is not None, an error occurred.
-    - liked_state indicates whether post is now liked (True) or unliked (False).
-    """
-
-    # Verify post exists
-    post_exists = await session.scalar(
-        select(Post.id).where(Post.id == post_id, Post.deleted_at.is_(None))
-    )
-    if not post_exists:
-        return False, "Post not found"
-
-    # Check if like exists (not deleted)
-    existing = await session.scalar(
-        select(PostLike).where(
-            PostLike.user_id == user_id,
-            PostLike.post_id == post_id,
-            PostLike.deleted_at.is_(None),
-        )
-    )
-
-    if existing:
-        # Unlike: soft delete the like
-        await session.execute(
-            update(PostLike)
-            .where(
-                PostLike.user_id == user_id,
-                PostLike.post_id == post_id,
-                PostLike.deleted_at.is_(None),
-            )
-            .values(deleted_at=func.now())
-        )
-        return False, None
-    else:
-        # Like: add a new like
-        new_like = PostLike(
-            user_id=user_id,
-            post_id=post_id,
-        )
-        session.add(new_like)
-        return True, None