fix: only run function inject for nostr entity

functions/[id].ts

@@ -1,9 +1,11 @@
 interface Env {}
 
 export const onRequest: PagesFunction<Env> = async context => {
-  const id = context.params.id as string;
+  const id = context.params.id as string | undefined;
 
+  const prefixes = ["npub1", "nprofile1", "naddr1", "nevent1", "note1"];
   const next = await context.next();
+  if (id && prefixes.some(a => id.startsWith(a))) {
     try {
       const rsp = await fetch(
         `http://nostr.api.v0l.io/api/v1/opengraph/${id}?canonical=${encodeURIComponent("https://zap.stream/%s")}`,
@@ -30,5 +32,6 @@ export const onRequest: PagesFunction<Env> = async context => {
     } catch {
       // ignore
     }
+  }
   return next;
 };