Harden render server and import boundaries

index.html

@@ -7,6 +7,10 @@
     <link rel="manifest" href="/manifest.webmanifest" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
     <meta name="theme-color" content="#17171b" />
+    <meta
+      http-equiv="Content-Security-Policy"
+      content="default-src 'self'; script-src 'self'; style-src 'self' 'unsafe-inline'; img-src 'self' data: blob:; media-src 'self' data: blob:; font-src 'self' data:; connect-src 'self' http://localhost:6000 http://127.0.0.1:6000 ws://localhost:5200 ws://127.0.0.1:5200; object-src 'none'; base-uri 'self'; frame-ancestors 'none'"
+    />
     <title>RUWIO</title>
   </head>
   <body>