fix(demo): use demo.* in permissive COEP rule (valid route source)

The demo(/.*)? form introduced a nested capturing group, which Next's
path-to-regexp route-source parser rejects ('Capturing groups are not
allowed'), failing the build. demo.* mirrors the strict-rule lookahead's
demo prefix without a nested group, matching the existing w/.* style.

Author: waleedlatif1

apps/sim/next.config.ts

@@ -222,7 +222,7 @@ const nextConfig: NextConfig = {
       },
       {
         // For main app routes, Google Drive Picker, the /demo Cal.com embed, and Vercel resources - use permissive policies
-        source: '/(w/.*|workspace/.*|api/tools/drive|demo(/.*)?|_next/.*|_vercel/.*)',
+        source: '/(w/.*|workspace/.*|api/tools/drive|demo.*|_next/.*|_vercel/.*)',
         headers: [
           {
             key: 'Cross-Origin-Embedder-Policy',