Decouple per-service Alembic migrations and fix cross-DB queries

Each service (blog, market, cart, events, federation, account) now owns
its own database schema with independent Alembic migrations. Removes the
monolithic shared/alembic/ that ran all migrations against a single DB.

- Add per-service alembic.ini, env.py, and 0001_initial.py migrations
- Add shared/db/alembic_env.py helper with table-name filtering
- Fix cross-DB FK in blog/models/snippet.py (users lives in db_account)
- Fix cart_impl.py cross-DB queries: fetch products and market_places
  via internal data endpoints instead of direct SQL joins
- Fix blog ghost_sync to fetch page_configs from cart via data endpoint
- Add products-by-ids and page-config-ensure data endpoints
- Update all entrypoint.sh to create own DB and run own migrations
- Cart now uses db_cart instead of db_market
- Add docker-compose.dev.yml, dev.sh for local development
- CI deploys both rose-ash swarm stack and rose-ash-dev compose stack
- Fix Quart namespace package crash (root_path in factory.py)

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

cart/alembic/env.py

@@ -0,0 +1,14 @@
+from alembic import context
+from shared.db.alembic_env import run_alembic
+
+MODELS = [
+    "shared.models.market",       # CartItem lives here
+    "shared.models.order",
+    "shared.models.page_config",
+]
+
+TABLES = frozenset({
+    "cart_items", "orders", "order_items", "page_configs",
+})
+
+run_alembic(context.config, MODELS, TABLES)

cart/alembic/versions/0001_initial.py

@@ -0,0 +1,92 @@
+"""Initial cart tables
+
+Revision ID: cart_0001
+Revises: None
+Create Date: 2026-02-26
+"""
+
+import sqlalchemy as sa
+from alembic import op
+
+revision = "cart_0001"
+down_revision = None
+branch_labels = None
+depends_on = None
+
+
+def _table_exists(conn, name):
+    result = conn.execute(sa.text(
+        "SELECT 1 FROM information_schema.tables WHERE table_schema='public' AND table_name=:t"
+    ), {"t": name})
+    return result.scalar() is not None
+
+
+def upgrade():
+    if _table_exists(op.get_bind(), "orders"):
+        return
+
+    op.create_table(
+        "page_configs",
+        sa.Column("id", sa.Integer, primary_key=True, autoincrement=True),
+        sa.Column("container_type", sa.String(32), nullable=False, server_default="page"),
+        sa.Column("container_id", sa.Integer, nullable=False),
+        sa.Column("features", sa.JSON, nullable=False, server_default="{}"),
+        sa.Column("sumup_merchant_code", sa.String(64), nullable=True),
+        sa.Column("sumup_api_key", sa.Text, nullable=True),
+        sa.Column("sumup_checkout_prefix", sa.String(64), nullable=True),
+        sa.Column("created_at", sa.DateTime(timezone=True), nullable=False, server_default=sa.func.now()),
+        sa.Column("updated_at", sa.DateTime(timezone=True), nullable=False, server_default=sa.func.now()),
+        sa.Column("deleted_at", sa.DateTime(timezone=True), nullable=True),
+    )
+
+    op.create_table(
+        "cart_items",
+        sa.Column("id", sa.Integer, primary_key=True, autoincrement=True),
+        sa.Column("user_id", sa.Integer, nullable=True),
+        sa.Column("session_id", sa.String(128), nullable=True),
+        sa.Column("product_id", sa.Integer, nullable=False),
+        sa.Column("quantity", sa.Integer, nullable=False, server_default="1"),
+        sa.Column("created_at", sa.DateTime(timezone=True), nullable=False, server_default=sa.func.now()),
+        sa.Column("updated_at", sa.DateTime(timezone=True), nullable=False, server_default=sa.func.now()),
+        sa.Column("market_place_id", sa.Integer, nullable=True, index=True),
+        sa.Column("deleted_at", sa.DateTime(timezone=True), nullable=True),
+    )
+    op.create_index("ix_cart_items_user_product", "cart_items", ["user_id", "product_id"])
+    op.create_index("ix_cart_items_session_product", "cart_items", ["session_id", "product_id"])
+
+    op.create_table(
+        "orders",
+        sa.Column("id", sa.Integer, primary_key=True, autoincrement=True),
+        sa.Column("user_id", sa.Integer, nullable=True),
+        sa.Column("session_id", sa.String(64), nullable=True, index=True),
+        sa.Column("page_config_id", sa.Integer, nullable=True, index=True),
+        sa.Column("status", sa.String(32), nullable=False, server_default="pending"),
+        sa.Column("currency", sa.String(16), nullable=False),
+        sa.Column("total_amount", sa.Numeric(12, 2), nullable=False),
+        sa.Column("description", sa.Text, nullable=True, index=True),
+        sa.Column("sumup_reference", sa.String(255), nullable=True, index=True),
+        sa.Column("sumup_checkout_id", sa.String(128), nullable=True, index=True),
+        sa.Column("sumup_status", sa.String(32), nullable=True),
+        sa.Column("sumup_hosted_url", sa.Text, nullable=True),
+        sa.Column("created_at", sa.DateTime(timezone=True), nullable=False, server_default=sa.func.now()),
+        sa.Column("updated_at", sa.DateTime(timezone=True), nullable=False, server_default=sa.func.now()),
+    )
+
+    op.create_table(
+        "order_items",
+        sa.Column("id", sa.Integer, primary_key=True, autoincrement=True),
+        sa.Column("order_id", sa.Integer, sa.ForeignKey("orders.id", ondelete="CASCADE"), nullable=False),
+        sa.Column("product_id", sa.Integer, nullable=False),
+        sa.Column("product_title", sa.String(512), nullable=True),
+        sa.Column("quantity", sa.Integer, nullable=False),
+        sa.Column("unit_price", sa.Numeric(12, 2), nullable=False),
+        sa.Column("currency", sa.String(16), nullable=False),
+        sa.Column("created_at", sa.DateTime(timezone=True), nullable=False, server_default=sa.func.now()),
+    )
+
+
+def downgrade():
+    op.drop_table("order_items")
+    op.drop_table("orders")
+    op.drop_table("cart_items")
+    op.drop_table("page_configs")