Add support for claude model

- Get the api key from : https://www.anthropic.com/product
- Add wrapper for anthropic.
- Integration the anthropic provider with the generate controller.
-Integration the anthropic provider with the chatbbot function.

Start by locating the generate controller and chatbot function, then inspect how existing model providers are wrapped and integrated. Add the Anthropic provider using an API key from Anthropic and verify that both generation and chatbot flows support the Claude model.

索引モデルが issue の本文から書いたものです。