ci(deploy): add migration control and deployment improvements

- Add SKIP_MIGRATION environment variable to control automatic Prisma migrations in backend
- Update Dockerfile to conditionally run migrations based on SKIP_MIGRATION flag
- Enhance deploy.sh with:
  - Better error handling using set -euo pipefail
  - New --skip-migration flag to bypass automatic migration startup
  - Improved documentation and help text
  - New helper functions for waiting on services and database
  - Better status reporting for migration results
- Update compose.yml to include SKIP_MIGRATION environment variable

compose.yml

@@ -23,6 +23,7 @@ services:
       IMPORTER_SERVICE_URL: "http://importer-api:3001"
       RECEIPT_TRACE_DECISIONS: "${RECEIPT_TRACE_DECISIONS:-0}"
       PRISMA_LOG_QUERIES: "${PRISMA_LOG_QUERIES:-0}"
+      SKIP_MIGRATION: "${SKIP_MIGRATION:-false}"
     volumes:
       - recipe_images:/app/recipe-images
     depends_on: