feat: add chat and file management APIs, implement chat loading and saving functionality

- Introduced new API endpoints for chat management including posting and retrieving chat messages.
- Implemented file upload and deletion functionalities for chat and other files.
- Added utility functions for streaming text and loading chat data.
- Created TypeScript types for models and agents used in the application.
- Configured TypeScript settings for server and project.
- Added favicon and workspace configuration for pnpm.

server/api/chat.post.ts

@@ -0,0 +1,55 @@
+import type { Message } from 'ai'
+import { appendResponseMessages, appendClientMessage, streamText } from 'ai'
+import { createWorkersAI } from 'workers-ai-provider'
+import { loadChat } from '~~/server/utils/chat'
+
+export default defineEventHandler(async (event) => {
+  const { id, message, model, agent } = await readBody(event)
+
+  console.log(model, agent)
+
+  const workersAI = createWorkersAI({ binding: hubAI() })
+
+  const previousMessages = await loadChat(id)
+
+  const messages = appendClientMessage({
+    messages: previousMessages,
+    message
+  })
+
+  const result = streamText({
+    model: workersAI('@cf/meta/llama-3.1-8b-instruct'),
+    // system, TODO: add system
+    // prompt, TODO: add prompt
+    messages,
+    // tools, TODO: add tools
+    async onFinish({ response }) {
+      await saveChat({
+        id,
+        messages: appendResponseMessages({
+          messages,
+          responseMessages: response.messages
+        })
+      })
+    }
+  })
+
+  result.consumeStream()
+
+  return result.toDataStreamResponse()
+})
+
+async function saveChat({ id, messages }: { id: string, messages: Message[] }) {
+  const hub = hubBlob()
+
+  await hub.delete(`chats/${id}.json`)
+  await $fetch('/api/chats', {
+    method: 'POST',
+    body: {
+      file: {
+        name: `${id}.json`,
+        content: JSON.stringify(messages, null, 2)
+      }
+    }
+  })
+}