M2: 主题系统（sablog经典+modern简约）+ 前台全部页面 + 老 URL 301 兼容 + markdown 双份导入

app/Models/Comment.php

@@ -29,6 +29,7 @@ class Comment extends Model
 
     protected $casts = [
         'ai_review' => 'array',
+        'created_at' => 'datetime',
     ];
 
     public $timestamps = false;

app/Models/Post.php

@@ -25,6 +25,7 @@ class Post extends Model implements HasMedia
         'slug',
         'excerpt',
         'content',
+        'content_format',
         'keywords',
         'status',
         'is_sticky',
@@ -82,6 +83,11 @@ class Post extends Model implements HasMedia
     public function registerMediaCollections(): void
     {
         $this->addMediaCollection('attachments')->useDisk(\App\Support\MediaDisk::name());
+        $this->addMediaCollection('cover')->useDisk(\App\Support\MediaDisk::name())
+            ->singleFile()
+            ->registerMediaConversions(function () {
+                $this->addMediaConversion('card')->width(1200)->height(630)->sharpen(1);
+            });
     }
 
     public function registerMediaConversions(?Media $media = null): void