Add Replicate.com provider support

[Copilot]

The @ai-sdk/replicate package only supports image models, not language models (vercel/ai#4918). This PR implements a custom Replicate provider that directly uses Replicate's HTTP API with streaming support.

Changes

• src/replicate.ts - New custom ReplicateLanguageModel implementing AI SDK's LanguageModelV2 interface

  • SSE streaming with polling fallback
  • Chat message formatting to Replicate's prompt format
  • Model parameters: temperature, max_new_tokens, top_p, top_k, stop_sequences

• src/llms.ts - Use custom provider instead of @ai-sdk/replicate

• package.json - Add "Replicate" to provider enum

Usage

Provider: Replicate
Model: deepseek-ai/deepseek-r1
       anthropic/claude-3.7-sonnet
       meta/llama-3-70b-instruct

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• googlechromelabs.github.io
  • Triggering command: /usr/local/bin/node /usr/local/bin/node install.mjs (dns block)
• https://storage.googleapis.com/chrome-for-testing-public/143.0.7499.42/linux64/chrome-linux64.zip
  • Triggering command: /usr/local/bin/node /usr/local/bin/node install.mjs (http block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

---

This section details on the original issue you should resolve

<issue_title>add provider replicate.com</issue_title>
<issue_description>### Describe the feature

hi
Can add new API provider.

https://replicate.com/collections/language-models

there is many models like
https://replicate.com/deepseek-ai/deepseek-r1/api
and
https://replicate.com/anthropic/claude-3.7-sonnet</issue_description>

<agent_instructions>write a custom replicate provider in our own code, refer the links mentioned in this issue for its docs</agent_instructions>

Comments on the Issue (you are @copilot in this section)

@feiskyer this doesn't work yet due to https://github.com/vercel/ai/issues/4918

• Fixes add provider replicate.com #446

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