Vercel ai gateway (#7)

* feat: use vercel ai gateway

* chore: update UI

test-request.js

@@ -0,0 +1,20 @@
+require('dotenv').config();
+const fetch = require('axios');
+
+async function testAPI() {
+  try {
+    const response = await fetch.post('http://localhost:3000/api/shortcut', {
+      command: 'anthropic',
+      parameters: {
+        question: 'What is 42?'
+      },
+      apiKey: process.env.USER_KEY
+    });
+
+    console.log('Success:', response.data);
+  } catch (error) {
+    console.error('Error:', error.response?.data || error.message);
+  }
+}
+
+testAPI();