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

app/Blog/Controllers/ArchiveController.php

@@ -20,8 +20,17 @@ class ArchiveController extends Controller
         return theme_view('archives', compact('archives'));
     }
 
-    public function month(string $year, string $month)
+    /**
+     * sablog 格式：/archives-{YYYYMM}.shtml
+     */
+    public function month(string $date)
     {
+        if (! preg_match('/^(\d{4})(\d{2})$/', $date, $m)) {
+            abort(404);
+        }
+
+        [$year, $month] = [$m[1], $m[2]];
+
         $start = Carbon::create((int) $year, (int) $month, 1)->startOfMonth();
         $end = (clone $start)->endOfMonth();