Move direct database queries in subscriptions.py to admin_subscription_service: - Add get_vendor() method to verify vendor exists - Add get_vendor_usage_counts() method for products/team counts - Update API endpoints to use service methods - Remove unused imports (func, Product, VendorUser) Fixes architecture validation errors [API-002] 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>