Support Dify Provider

[mumei-xxxx]

Feature Description

The example can be found in the OpenAI Provider:

https://sdk.vercel.ai/providers/ai-sdk-providers/openai

It would be great if you could add a provider like Dify

https://docs.dify.ai/guides/application-publishing/based-on-frontend-templates

to make it usable with Vercel AI SDK.

Use Cases

import { createDify } from "@ai-sdk/dify";
import { streamObject } from 'ai';
import { z } from 'zod';

const dify = createDify({
    response_mode: "streaming",
    inputs: {
        name: "John Doe",
    },
});

const { partialObjectStream } = streamObject({
  model: dify,
  schema: z.object({
    recipe: z.object({
      name: z.string(),
      ingredients: z.array(z.string()),
      steps: z.array(z.string()),
    }),
  }),
  prompt: 'Generate a lasagna recipe.',
});

for await (const partialObject of partialObjectStream) {
  console.clear();
  console.log(partialObject);
}

Additional context

No response