fix(deploy): improve deployment robustness and reliability

- Add docker volume prune to deploy.sh to prevent stale code issues
- Add automatic migrations and cache warmup to staging entrypoint
- Fix nginx race condition by waiting for PHP-FPM before starting
- Improve PHP healthcheck to use php-fpm-healthcheck
- Add curl to production nginx Dockerfile for healthchecks
- Add ensureSeedsTable() to SeedRepository for automatic table creation
- Update SeedCommand to ensure seeds table exists before operations

This prevents 502 Bad Gateway errors during deployment and ensures
fresh code is deployed without volume cache issues.

deployment/scripts/deploy.sh

@@ -121,6 +121,13 @@ docker compose $COMPOSE_FILES pull || print_warning "Failed to pull some images,
 print_info "Stopping existing containers..."
 docker compose $COMPOSE_FILES down --remove-orphans || print_warning "No existing containers to stop"
 
+# Staging: Remove named volume to ensure fresh code from image
+# This prevents stale code persisting between deployments
+if [ "$ENVIRONMENT" = "staging" ]; then
+    print_info "Removing staging code volume to ensure fresh deployment..."
+    docker volume rm staging-code 2>/dev/null || print_info "No stale staging volume to remove"
+fi
+
 # Remove any orphaned containers with conflicting names
 for container in nginx php redis scheduler queue-worker; do
     if docker ps -a --format '{{.Names}}' | grep -q "^${container}$"; then