feat(create-voltagent-app): Add Cerebras API

[koji]

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://voltagent.dev/docs/community/contributing/#commit-convention

Bugs / Features

• Related issue(s) linked
• Tests for the changes have been added
• Docs have been added / updated
• Changesets have been added https://voltagent.dev/docs/community/contributing/#creating-a-changeset

What is the current behavior?

? Which AI provider would you like to use? (Use arrow keys)
❯ OpenAI (GPT-4o-mini) 
  Anthropic (Claude 3.5 Sonnet) 
  Google (Gemini 2.0 Flash) 
  Groq (Llama 3.3 70B) 
  Mistral (Mistral Large 2) 
  Ollama (Llama 3.2 - Local) 

What is the new behavior?

add Cerebras API with gpt-oss-120b

? Which AI provider would you like to use? (Use arrow keys)
❯ OpenAI (GPT-4o-mini) 
  Anthropic (Claude 3.5 Sonnet) 
  Google (Gemini 2.0 Flash) 
  Groq (Llama 3.3 70B) 
  Mistral (Mistral Large 2) 
  Ollama (Llama 3.2 - Local) 
  Cerebras (GPT-OSS-120B) 

fixes (issue)

Notes for reviewers

[changeset-bot]

🦋 Changeset detected

Latest commit: 0e56b10

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
create-voltagent-app	Minor

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[omeraplak]

Hey @koji ,
Thank you! We'll review it soon!