fix: Dockerfile, entrypoint, and CI for multi-repo deployment

- Fix requirements.txt path to shared_lib/requirements.txt
- Remove alembic migrations (managed by blog service)
- Fix APP_MODULE default to app:app
- CI: add git submodule update, deploy shared coop stack from /root/coop

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

entrypoint.sh

@@ -10,9 +10,8 @@ if [[ -n "${DATABASE_HOST:-}" && -n "${DATABASE_PORT:-}" ]]; then
   done
 fi
 
-# Run DB migrations (uses alembic.ini/env.py to resolve the DB URL)
-echo "Running Alembic migrations..."
-alembic upgrade head
+# NOTE: Cart app does NOT run Alembic migrations.
+# Migrations are managed by the blog app which owns the shared database schema.
 
 # Clear Redis page cache on deploy
 if [[ -n "${REDIS_URL:-}" && "${REDIS_URL}" != "no" ]]; then
@@ -26,6 +25,5 @@ print('Redis cache cleared.')
 fi
 
 # Start the app
-# APP_MODULE can be overridden per-service (e.g. apps.market.app:app)
-echo "Starting Hypercorn (${APP_MODULE:-suma_browser.app.app:app})..."
-PYTHONUNBUFFERED=1 exec hypercorn "${APP_MODULE:-suma_browser.app.app:app}" --bind 0.0.0.0:${PORT:-8000}
+echo "Starting Hypercorn (${APP_MODULE:-app:app})..."
+PYTHONUNBUFFERED=1 exec hypercorn "${APP_MODULE:-app:app}" --bind 0.0.0.0:${PORT:-8000}