feat: replace groq with cf-ai

[idosal]

No description provided.

[Copilot]

Pull Request Overview

This PR replaces the previous groq-based AI provider with a new workers-ai-provider implementation. Key changes include:

• Removing the old getModel mechanism and replacing it with createWorkersAI using the CloudflareEnvironment's AI binding.
• Modifying the model usage in the streamText function by passing the workersai model directly instead of using model.languageModel(selectedModel).

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Comments suppressed due to low confidence (2)

app/routes/api.chat.ts:48

• The new workersai function is used to obtain the model, which bypasses the previous call to languageModel(selectedModel). Please verify that the model object returned has the correct interface required by streamText.

const model = workersai("@cf/deepseek-ai/deepseek-r1-distill-qwen-32b", {});

app/routes/api.chat.ts:70

• Since the prior implementation invoked model.languageModel(selectedModel) to select the appropriate model, ensure that passing the model object directly meets the expected interface for streamText.

model: model,