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]
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>