feat: vercel/ai binding

[himself65]

basic example:

import { createWorkflow, workflowEvent } from "@llama-flow/core";
import { mergeToWorkflow } from "@llama-flow/core/ai";
import { streamText } from "ai";
import { openai } from "@ai-sdk/openai";

const chatWorkflow = createWorkflow();

const startChatEvent = workflowEvent<string>();
const stopChatEvent = workflowEvent();

chatWorkflow.handle([startChatEvent], async () => {
  const result = streamText({
    model: openai("gpt-4.1"),
    prompt: "You are a helpful assistant.",
  });
  await mergeToWorkflow(result.fullStream);
  return stopChatEvent.with();
});

export { startChatEvent, stopChatEvent, chatWorkflow };

app.post("/chat", async (context) => {
  const { messages } = await context.req.json();
  const { stream, sendEvent } = chatWorkflow.createContext();
  sendEvent(startChatEvent.with(messages));
  return new Response(dataStream(stream));
});

// frontend
import { useChat } from 'ai/react'

useChat({
  api: '/chat'
})

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commit: da20c69

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