frontend: provide Clerk-safe wrappers for secretless CI prerender

frontend/src/proxy.ts

@@ -1,6 +1,18 @@
+import { NextResponse } from "next/server";
 import { clerkMiddleware } from "@clerk/nextjs/server";
 
-export default clerkMiddleware();
+const isClerkEnabled = () => {
+  const key = process.env.NEXT_PUBLIC_CLERK_PUBLISHABLE_KEY;
+  if (!key) return false;
+  const m = /^pk_(test|live)_([A-Za-z0-9]+)$/.exec(key);
+  if (!m) return false;
+  const body = m[2];
+  if (body.length < 16) return false;
+  if (/^0+$/.test(body)) return false;
+  return true;
+};
+
+export default isClerkEnabled() ? clerkMiddleware() : () => NextResponse.next();
 
 export const config = {
   matcher: [