Add AI chat feature

server/modules/chat/index.ts

@@ -0,0 +1,15 @@
+import { Elysia } from "elysia";
+
+import { ChatModel } from "./model";
+import { Chat } from "./service";
+
+export const chat = new Elysia({ prefix: "/chat" }).post(
+  "/",
+  async ({ body }) => {
+    const stream = await Chat.streamText(body);
+    return stream.toUIMessageStreamResponse();
+  },
+  {
+    body: ChatModel.chat,
+  },
+);