fix(import): preserve original attachment filepath structure; enable admin SPA mode

app/Blog/Services/AttachmentImporter.php

@@ -53,31 +53,42 @@ class AttachmentImporter
 
         if ($source && $syncNow) {
             try {
-                $media = $post->addMedia($source)
-                    ->preservingOriginal()
-                    ->withCustomProperties($properties)
-                    ->usingFileName(basename($row['filename']) ?: basename($source))
-                    ->toMediaCollection('attachments', MediaDisk::name());
+                $disk = MediaDisk::name();
+                $filename = basename($row['filename']) ?: basename($source);
+                $legacyPath = ltrim($row['filepath'] ?? '', '/');
 
-                $media->setCustomProperty('pending_sync', false);
+                // 保留原始目录结构：date_200802/xxx.jpg
+                if ($legacyPath) {
+                    $legacyDir = dirname($legacyPath);
+                    $storagePath = ($legacyDir !== '.' ? $legacyDir . '/' : '') . $filename;
+                } else {
+                    $storagePath = $filename;
+                }
+
+                // 直接写文件到目标存储，不走 spatie 的自动路径生成
+                $content = file_get_contents($source);
+                \Illuminate\Support\Facades\Storage::disk($disk)->put($storagePath, $content, ['visibility' => 'public']);
+
+                // 手动创建 media 记录
+                $media = new Media;
+                $media->model_type = Post::class;
+                $media->model_id = $post->id;
+                $media->uuid = (string) Str::uuid();
+                $media->collection_name = 'attachments';
+                $media->name = pathinfo($filename, PATHINFO_FILENAME) ?: 'attachment';
+                $media->file_name = $filename;
+                $media->mime_type = $row['filetype'] ?: null;
+                $media->size = (int) ($row['filesize'] ?? 0);
+                $media->disk = $disk;
+                $media->conversions_disk = $disk;
+                $media->manipulations = [];
+                $media->custom_properties = $properties;
+                $media->generated_conversions = [];
+                $media->responsive_images = [];
                 $media->save();
 
                 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,