chore: Add CORS headers to API routes in vercel.json for improved cross-origin resource sharing

Author: SivaramPg

vercel.json

@@ -1,5 +1,15 @@
 {
 	"trailingSlash": false,
+	"headers": [
+		{
+			"source": "/api/(.*)",
+			"headers": [
+				{ "key": "Access-Control-Allow-Origin", "value": "*" },
+				{ "key": "Access-Control-Allow-Methods", "value": "GET, OPTIONS" },
+				{ "key": "Access-Control-Allow-Headers", "value": "Content-Type" }
+			]
+		}
+	],
 	"rewrites": [
 		{
 			"source": "/ingest/static/:path*",