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/AttachmentImporter.php

@@ -16,6 +16,19 @@ class AttachmentImporter
      */
     public function create(int $postId, array $row, ?string $attachmentsDir, bool $syncNow): Media
     {
+        $legacyId = (int) ($row['attachmentid'] ?? 0);
+
+        // 幂等：同一老附件已成功导入过则直接复用
+        $existing = Media::query()
+            ->where('collection_name', 'attachments')
+            ->where('custom_properties->legacy_attachmentid', $legacyId)
+            ->latest('id')
+            ->first();
+
+        if ($existing && ! $existing->getCustomProperty('pending_sync')) {
+            return $existing;
+        }
+
         $post = Post::find($postId);
 
         // 游离附件（articleid=0 或对应文章不存在）统一挂到 id=0 占位文章上
@@ -36,16 +49,39 @@ class AttachmentImporter
         $source = $this->locateSource($row['filepath'] ?? null, $attachmentsDir);
 
         if ($source && $syncNow) {
-            $media = $post->addMedia($source)
-                ->preservingOriginal()
-                ->withCustomProperties($properties)
-                ->usingFileName(basename($row['filename']) ?: basename($source))
-                ->toMediaCollection('attachments', MediaDisk::name());
+            try {
+                $media = $post->addMedia($source)
+                    ->preservingOriginal()
+                    ->withCustomProperties($properties)
+                    ->usingFileName(basename($row['filename']) ?: basename($source))
+                    ->toMediaCollection('attachments', MediaDisk::name());
 
-            $media->setCustomProperty('pending_sync', false);
-            $media->save();
+                $media->setCustomProperty('pending_sync', false);
+                $media->save();
 
-            return $media;
+                return $media;
+            } catch (\Throwable $e) {
+                // addMedia 可能已插入记录并保存文件，仅缩略图生成失败：找回该记录标记完成
+                $existing = Media::query()
+                    ->where('collection_name', 'attachments')
+                    ->where('custom_properties->legacy_attachmentid', (int) ($row['attachmentid'] ?? 0))
+                    ->latest('id')
+                    ->first();
+
+                if ($existing) {
+                    $existing->setCustomProperty('pending_sync', false);
+                    $existing->save();
+
+                    return $existing;
+                }
+
+                // 文件损坏无法入库时降级为 pending，不中断整批导入
+                \Illuminate\Support\Facades\Log::warning('附件导入失败，已降级为待同步', [
+                    'attachment' => $row['attachmentid'] ?? null,
+                    'file' => $source,
+                    'error' => $e->getMessage(),
+                ]);
+            }
         }
 
         return $this->createPendingRecord($post->id, $row, $properties);