Remove [...id].astro, use _redirects 200 proxy

src/pages/[...id].astro

@@ -1,23 +0,0 @@
----
-import { getCollection } from 'astro:content';
-
-export async function getStaticPaths() {
-  const posts = await getCollection('blog');
-  
-  // Generate paths for both /blog/slug and /slug
-  const paths = [];
-  
-  for (const post of posts) {
-    // /blog/slug - the original path
-    paths.push({
-      params: { id: post.id },
-      props: { slug: post.id },
-    });
-  }
-  
-  return paths;
-}
-
-const { slug } = Astro.props;
-return Astro.redirect(`/blog/${slug}`, 301);
----