fix(web): move ao-core from transpilePackages to serverExternalPackages

Next.js errors when a package is in both lists:
  'transpilePackages' conflicts with 'serverExternalPackages'

Remove @aoagents/ao-core from transpilePackages and keep it only
in serverExternalPackages. This prevents webpack from bundling
ao-core and baking import.meta.url as the build machine's path.

packages/web/next.config.js

@@ -9,7 +9,6 @@ const homeDir = os.homedir().replace(/\\/g, "/");
 const nextConfig = {
   outputFileTracingRoot: path.join(__dirname, "../.."),
   transpilePackages: [
-    "@aoagents/ao-core",
     "@aoagents/ao-plugin-agent-claude-code",
     "@aoagents/ao-plugin-agent-codex",
     "@aoagents/ao-plugin-agent-opencode",