New enterprise feature

services/tenant/app/schemas/tenants.py

@@ -63,6 +63,8 @@ class TenantResponse(BaseModel):
     subdomain: Optional[str]
     business_type: str
     business_model: Optional[str]
+    tenant_type: Optional[str] = "standalone"  # standalone, parent, or child
+    parent_tenant_id: Optional[str] = None  # For child tenants
     address: str
     city: str
     postal_code: str
@@ -75,7 +77,7 @@ class TenantResponse(BaseModel):
     created_at: datetime
 
     # ✅ FIX: Add custom validator to convert UUID to string
-    @field_validator('id', 'owner_id', mode='before')
+    @field_validator('id', 'owner_id', 'parent_tenant_id', mode='before')
     @classmethod
     def convert_uuid_to_string(cls, v):
         """Convert UUID objects to strings for JSON serialization"""