feat: restore sablog browse modes and clean imported HTML

Keep the public site readable after import (nbsp, highlighter, wrapping code, compact pager) and finish the admin extras already in this tree: sticky levels, preview, page cache, and live llms.txt.

Co-authored-by: Cursor <cursoragent@cursor.com>

app/Blog/Controllers/FeedController.php

@@ -2,12 +2,10 @@
 
 declare(strict_types=1);
 
-
 namespace App\Blog\Controllers;
 
 use App\Models\Post;
 use Illuminate\Http\Response;
-use Illuminate\Support\Facades\DB;
 
 class FeedController extends Controller
 {
@@ -54,7 +52,9 @@ class FeedController extends Controller
         foreach ($disallow as $path) {
             $lines[] = "Disallow: {$path}";
         }
-        $lines[] = "Sitemap: ".url($sitemap);
+        $lines[] = 'Sitemap: '.url($sitemap);
+        $lines[] = 'Allow: /llms.txt';
+        $lines[] = 'Allow: /posts/*.md';
 
         return response(implode("\n", $lines)."\n")->header('Content-Type', 'text/plain; charset=utf-8');
     }