Fix AI model to minimax-m2.7

src/app/api/ai/route.ts

@@ -48,7 +48,7 @@ export async function POST(request: Request) {
         Authorization: `Bearer ${LITELLM_API_KEY}`,
       },
       body: JSON.stringify({
-        model: "gpt-4o-mini",
+        model: "minimax-m2.7",
         messages: allMessages,
         max_tokens: 500,
       }),