fix: post list loading

Author: Innei

src/app/posts/(post-detail)/[category]/[slug]/loading.tsx renamed to src/app/posts/(post-detail)/loading.tsx

@@ -0,0 +1,10 @@
+import { NormalContainer } from '~/components/layout/container/Normal'
+import { Loading } from '~/components/ui/loading'
+
+export default function PostListLoading() {
+  return (
+    <NormalContainer>
+      <Loading useDefaultLoadingText />
+    </NormalContainer>
+  )
+}