refactor: switch to free-trial/private-deploy/buyout pricing, fix feature gaps, add SEO landing + deploy config

backend/app/models/__init__.py

@@ -24,6 +24,7 @@ from .user_credit import UserCredit
 from .credit_consumption import CreditConsumption
 from .credit_purchase import CreditPurchase
 from .agent_pipeline import AgentPipeline
+from .enterprise_lead import EnterpriseLead
 
 __all__ = [
     "User", "Product",
@@ -47,4 +48,5 @@ __all__ = [
     "CreditConsumption",
     "CreditPurchase",
     "AgentPipeline",
+    "EnterpriseLead",
 ]