fix(filesystem): 修复文件上传验证规则配置问题

- 移除了 fileSize 验证规则中的逗号分隔符，确保验证规则正确解析
- 修正了文件上传控制器中的验证配置，提高文件上传稳定性
- 保持了原有的文件大小限制和文件类型验证逻辑

src/Controller/FileController.php

@@ -35,7 +35,7 @@ class FileController
     {
         $file = $request->file('file');
         validate([
-            'file' => 'require|fileSize:' . (1024 * 1024 * 100) . ',fileExt:png,jpg,jpeg,gif,mp4|fileMime:image/png,image/jpg,image/jpeg,image/gif,video/mp4',
+            'file' => 'require|fileSize:' . (1024 * 1024 * 100) . '|fileExt:png,jpg,jpeg,gif,mp4|fileMime:image/png,image/jpg,image/jpeg,image/gif,video/mp4',
         ], [
             'file.require' => '请选择文件',
             'file.fileSize' => '文件过大',
@@ -57,7 +57,7 @@ class FileController
         $file = $request->file('file');
         validate([
             'category_id' => 'egt:0',
-            'file' => 'require|fileSize:' . (1024 * 1024 * 100) . ',fileExt:png,jpg,jpeg,gif,mp4|fileMime:image/png,image/jpg,image/jpeg,image/gif,video/mp4',
+            'file' => 'require|fileSize:' . (1024 * 1024 * 100) . '|fileExt:png,jpg,jpeg,gif,mp4|fileMime:image/png,image/jpg,image/jpeg,image/gif,video/mp4',
         ], [
             'category_id.egt' => '分类ID不能小于0',
             'file.require' => '请选择文件',