Feat: Add wencai operator #3221 (#9116)

### What problem does this PR solve?

Feat: Add wencai operator #3221

### Type of change


- [x] New Feature (non-breaking change which adds functionality)

web/src/pages/agent/canvas/node/dropdown/next-step-dropdown.tsx

@@ -112,6 +112,7 @@ function AccordionOperators() {
               Operator.PubMed,
               Operator.GitHub,
               Operator.Invoke,
+              Operator.WenCai,
             ]}
           ></OperatorItemList>
         </AccordionContent>