refactor(routes): canonical URLs now match sablog format exactly

- /show-{id}.shtml (comments page: /show-{id}-{page}.shtml)
- /category-{cid}.shtml / /category-{cid}-{page}.shtml
- /archives-{YYYYMM}.shtml / /archives-{YYYYMM}-{page}.shtml
- /tag/{name}, /tagslist.shtml, /index-{page}.shtml
- slug 时代的 /posts/{slug} 等旧格式全部 301 到 sablog 格式

resources/views/feed/rss.blade.php

@@ -10,8 +10,8 @@
         @foreach($posts as $post)
             <item>
                 <title>{{ $post->title }}</title>
-                <link>{{ route('posts.show', $post->slug ?: $post->id) }}</link>
-                <guid isPermaLink="true">{{ route('posts.show', $post->slug ?: $post->id) }}</guid>
+                <link>{{ route('posts.show', $post->id) }}</link>
+                <guid isPermaLink="true">{{ route('posts.show', $post->id) }}</guid>
                 <pubDate>{{ $post->published_at->toRssString() }}</pubDate>
                 <description>{{ Str::limit(strip_tags($post->excerpt_or_fallback), 300) }}</description>
                 @if($post->category)

resources/views/feed/sitemap.blade.php

@@ -17,7 +17,7 @@
     </url>
     @foreach($posts as $post)
         <url>
-            <loc>{{ route('posts.show', $post->slug ?: $post->id) }}</loc>
+            <loc>{{ route('posts.show', $post->id) }}</loc>
             <lastmod>{{ $post->updated_at?->toAtomString() }}</lastmod>
             <changefreq>monthly</changefreq>
             <priority>0.8</priority>