feat(agent): Adds prologue functionality (#9336)

### What problem does this PR solve?

feat(agent): Adds prologue functionality #3221

- Add a prologue field to the IInputs type
- Initialize the prologue state in the chat container
- Use useEffect to monitor prologue changes and add prologue responses
### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

web/src/pages/agent/chat/use-send-agent-message.ts

     resetSession,
     findReferenceByMessageId,
     appendUploadResponseList,
+    addNewestOneAnswer,
   };
 };

web/src/pages/agent/interface.ts

   avatar: string;
   title: string;
   inputs: Record<string, BeginQuery>;
+  prologue: string;
 };

web/src/pages/next-chats/share/index.tsx

     parameterDialogVisible,
     showParameterDialog,
     sendFormMessage,
+    addNewestOneAnswer,
     ok,
     resetSession,
   } = useSendNextSharedMessage(addEventList);
     avatar: '',
     title: '',
     inputs: {},
+    prologue: '',
   });
   const handleUploadFile: NonNullable<FileUploadProps['onUpload']> =
     useCallback(
       avatar,
       title,
       inputs: inputs,
+      prologue: '',
     });
   }, [inputsData, setAgentInfo]);
 
+  React.useEffect(() => {
+    if (inputsData.prologue) {
+      addNewestOneAnswer({
+        answer: inputsData.prologue,
+      });
+    }
+  }, [inputsData.prologue, addNewestOneAnswer]);
+
   React.useEffect(() => {
     if (inputsData && inputsData.inputs && !isEmpty(inputsData.inputs)) {
       showParameterDialog();