feat(post-output): add save-only and load-history endpoints

app/common/tools/PhoneImage.php

@@ -212,4 +212,23 @@ class PhoneImage implements PostOutputManagerInterface
             'page_count' => $pageCount,
         ]) > 0;
     }
+
+    /**
+     * 仅保存配置（不生成图片），创建新的历史记录
+     * @param int $postId 文章ID
+     * @param array $config 配置(含 size/fontSize/watermark/pageAlignments/content_html)
+     * @param int $adminId 管理员ID
+     * @return PostOutput
+     */
+    public static function saveConfigOnly(int $postId, array $config, int $adminId): PostOutput
+    {
+        return PostOutput::create([
+            'post_id' => $postId,
+            'output_type' => 'phone_image',
+            'config' => $config,
+            'status' => PostOutput::STATUS_PROCESSING,
+            'page_count' => 0,
+            'admin_id' => $adminId,
+        ]);
+    }
 }