docs: prepare for chat components (#3844)

docs/server/api/chat.ts

@@ -0,0 +1,22 @@
+import { streamText } from 'ai'
+import { createWorkersAI } from 'workers-ai-provider'
+
+export default defineEventHandler(async (event) => {
+  const { messages } = await readBody(event)
+
+  // Enable AI Gateway if defined in environment variables
+  const gateway = process.env.CLOUDFLARE_AI_GATEWAY_ID
+    ? {
+        id: process.env.CLOUDFLARE_AI_GATEWAY_ID,
+        cacheTtl: 60 * 60 * 24 // 24 hours
+      }
+    : undefined
+  const workersAI = createWorkersAI({ binding: hubAI(), gateway })
+
+  return streamText({
+    model: workersAI('@cf/meta/llama-3.2-3b-instruct'),
+    maxTokens: 10000,
+    system: 'You are a helpful assistant that can answer questions and help.',
+    messages
+  }).toDataStreamResponse()
+})