Feat: Convert the prompt field of the agent operator to an array #3221 (#8137)

### What problem does this PR solve?

Feat: Convert the prompt field of the agent operator to an array #3221

### Type of change


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

web/src/pages/agent/form/agent-form/use-values.ts

@@ -0,0 +1,30 @@
+import { useFetchModelId } from '@/hooks/logic-hooks';
+import { RAGFlowNodeType } from '@/interfaces/database/flow';
+import { get, isEmpty } from 'lodash';
+import { useMemo } from 'react';
+import { initialAgentValues } from '../../constant';
+
+export function useValues(node?: RAGFlowNodeType) {
+  const llmId = useFetchModelId();
+
+  const defaultValues = useMemo(
+    () => ({
+      ...initialAgentValues,
+      llm_id: llmId,
+      prompts: '',
+    }),
+    [llmId],
+  );
+
+  const values = useMemo(() => {
+    const formData = node?.data?.form;
+
+    if (isEmpty(formData)) {
+      return defaultValues;
+    }
+
+    return { ...formData, prompts: get(formData, 'prompts.0.content', '') };
+  }, [defaultValues, node?.data?.form]);
+
+  return values;
+}