fix(baoyu-compress-image): rename original as backup instead of deleting

skills/baoyu-compress-image/scripts/main.ts

@@ -147,7 +147,9 @@ async function processFile(
   const outputSize = statSync(tempOutput).size;
 
   if (!opts.keep && absInput !== output) {
-    unlinkSync(absInput);
+    const ext = extname(absInput);
+    const base = absInput.slice(0, -ext.length);
+    renameSync(absInput, `${base}_original${ext}`);
   }
   renameSync(tempOutput, output);