修改id生成机制

bin/util/vips.dart

@@ -17,7 +17,7 @@ class Vips {
   /// 如果同时指定 [w] 和 [h]，图片将按比例缩放以适应指定尺寸
   Future<File> generatePreview(String imgPath, {int? w, int? h}) async {
     // 生成缓存文件名：包含原图 hash 和尺寸信息
-    final baseName = basename(imgPath).hashCode.toString();
+    final baseName = imgPath.hashCode.toString();
     final sizeSuffix = _buildSizeSuffix(w, h);
     final imgOut = "$cacheDir/preview/$baseName$sizeSuffix.webp";
     final outFile = File(imgOut);