feat: add changelog/roadmap types, Sanity queries, and public route whitelist

middleware.ts

@@ -25,6 +25,10 @@ function isPublicPath(pathname: string) {
   if (pathname === "/guides") return true;
   if (pathname.startsWith("/guides/")) return true;
 
+  // Changelog and feedback — always public
+  if (pathname === "/changelog") return true;
+  if (pathname === "/feedback") return true;
+
   // Static / framework assets
   if (pathname.startsWith("/_next")) return true;
   if (pathname === "/favicon.ico") return true;