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>

docker-compose.yml

@@ -76,9 +76,11 @@ services:
     environment:
       <<: *app-env
       DATABASE_URL: postgresql+asyncpg://postgres:change-me@pgbouncer:5432/db_market
+      ALEMBIC_DATABASE_URL: postgresql+psycopg://postgres:change-me@db:5432/db_market
       REDIS_URL: redis://redis:6379/1
       DATABASE_HOST: db
       DATABASE_PORT: "5432"
+      RUN_MIGRATIONS: "true"
       WORKERS: "1"
 
   cart:
@@ -89,10 +91,12 @@ services:
       dockerfile: cart/Dockerfile
     environment:
       <<: *app-env
-      DATABASE_URL: postgresql+asyncpg://postgres:change-me@pgbouncer:5432/db_market
+      DATABASE_URL: postgresql+asyncpg://postgres:change-me@pgbouncer:5432/db_cart
+      ALEMBIC_DATABASE_URL: postgresql+psycopg://postgres:change-me@db:5432/db_cart
       REDIS_URL: redis://redis:6379/2
       DATABASE_HOST: db
       DATABASE_PORT: "5432"
+      RUN_MIGRATIONS: "true"
       WORKERS: "1"
 
   events:
@@ -104,9 +108,11 @@ services:
     environment:
       <<: *app-env
       DATABASE_URL: postgresql+asyncpg://postgres:change-me@pgbouncer:5432/db_events
+      ALEMBIC_DATABASE_URL: postgresql+psycopg://postgres:change-me@db:5432/db_events
       REDIS_URL: redis://redis:6379/3
       DATABASE_HOST: db
       DATABASE_PORT: "5432"
+      RUN_MIGRATIONS: "true"
       WORKERS: "1"
 
   federation:
@@ -118,9 +124,11 @@ services:
     environment:
       <<: *app-env
       DATABASE_URL: postgresql+asyncpg://postgres:change-me@pgbouncer:5432/db_federation
+      ALEMBIC_DATABASE_URL: postgresql+psycopg://postgres:change-me@db:5432/db_federation
       REDIS_URL: redis://redis:6379/4
       DATABASE_HOST: db
       DATABASE_PORT: "5432"
+      RUN_MIGRATIONS: "true"
       WORKERS: "1"
 
   account:
@@ -132,9 +140,11 @@ services:
     environment:
       <<: *app-env
       DATABASE_URL: postgresql+asyncpg://postgres:change-me@pgbouncer:5432/db_account
+      ALEMBIC_DATABASE_URL: postgresql+psycopg://postgres:change-me@db:5432/db_account
       REDIS_URL: redis://redis:6379/5
       DATABASE_HOST: db
       DATABASE_PORT: "5432"
+      RUN_MIGRATIONS: "true"
       WORKERS: "1"
 
   db:
@@ -147,10 +157,6 @@ services:
       - db_data_1:/var/lib/postgresql/data
     networks:
       appnet:
-    configs:
-      - source: schema_sql
-        target: /run/configs/schema_sql
-        mode: 0444
     deploy:
       placement:
         constraints:
@@ -226,6 +232,3 @@ networks:
   externalnet:
     driver: overlay
     external: true
-configs:
-  schema_sql:
-    file: ./schema.sql