更新 release.yml，修改 git show 命令以去除提交头信息，简化发布日志生成逻辑，提升了代码的可读性和维护性。

Author: Flames1217

.github/workflows/release.yml

@@ -44,7 +44,7 @@ jobs:
           if git rev-parse HEAD^ >/dev/null 2>&1; then
             git diff HEAD^ HEAD > diff.txt
           else
-            git show HEAD --pretty="" --no-commit-header > diff.txt
+            git show --pretty="" HEAD > diff.txt
           fi
 
       - name: Generate AI Release Notes