fix: [attach] 短代码跨文章全局解析 + 缺失残留清理；损坏附件导入降级不中断；media 导入幂等；sablog:import 支持 sqlite 老库 + 5 个导入自动化测试

app/Blog/Services/PostContentRenderer.php

@@ -3,10 +3,12 @@
 namespace App\Blog\Services;
 
 use App\Models\Post;
+use Illuminate\Support\Facades\Cache;
 use League\CommonMark\Environment\Environment;
 use League\CommonMark\Extension\CommonMark\CommonMarkCoreExtension;
 use League\CommonMark\Extension\GithubFlavoredMarkdownExtension;
 use League\CommonMark\MarkdownConverter;
+use Spatie\MediaLibrary\MediaCollections\Models\Media;
 
 class PostContentRenderer
 {
@@ -63,9 +65,16 @@ class PostContentRenderer
             return $html;
         }
 
-        $mediaItems = $post->getMedia('attachments');
-        $byLegacyId = $mediaItems->keyBy(fn ($m) => (int) $m->getCustomProperty('legacy_attachmentid'));
-        $ordered = $mediaItems->values();
+        // 短代码引用的是 sablog 全局附件 id，可能属于其他文章，需要全局查
+        $byLegacyId = Cache::remember('attach.legacy_ids', now()->addHour(), function () {
+            return Media::query()
+                ->where('collection_name', 'attachments')
+                ->get()
+                ->keyBy(fn ($m) => (int) $m->getCustomProperty('legacy_attachmentid'));
+        });
+
+        // 当前文章媒体用于索引回退
+        $ordered = $post->getMedia('attachments')->values();
 
         foreach ($matches as $match) {
             $full = $match[0];
@@ -80,6 +89,8 @@ class PostContentRenderer
             }
 
             if (! $media) {
+                // 找不到媒体时移除残留短代码，避免把 [attach=999] 当正文显示
+                $html = str_replace($full, '', $html);
                 continue;
             }