security: add CSP and HSTS headers to vercel.json

vercel.json

@@ -1,13 +1,30 @@
 {
   "rewrites": [
-        { "source": "/api/(.*)", "destination": "/api/$1" }
+    {
+      "source": "/api/(.*)",
+      "destination": "/api/$1"
+    }
   ],
   "headers": [
     {
       "source": "/(.*)",
       "headers": [
-                { "key": "X-Content-Type-Options", "value": "nosniff" },
+        {
-                { "key": "X-Frame-Options", "value": "DENY" }
+          "key": "X-Content-Type-Options",
+          "value": "nosniff"
+        },
+        {
+          "key": "X-Frame-Options",
+          "value": "DENY"
+        },
+        {
+          "key": "Content-Security-Policy",
+          "value": "default-src 'self'; script-src 'self' 'unsafe-inline' 'unsafe-eval' https://unpkg.com https://cdn.jsdelivr.net https://esm.sh; style-src 'self' 'unsafe-inline' https://fonts.googleapis.com https://fonts.gstatic.com; font-src 'self' data: https://fonts.gstatic.com; img-src 'self' data: https:; media-src 'self' https:; connect-src 'self' https://api.soar-enrich.com wss://api.soar-enrich.com https:; worker-src 'self'; frame-ancestors 'none';"
+        },
+        {
+          "key": "Strict-Transport-Security",
+          "value": "max-age=31536000; includeSubDomains"
+        }
       ]
     }
   ]