优化IO问题

utils/markdown_to_image.py

@@ -1,4 +1,5 @@
 import subprocess
+import time
 
 import markdown
 from playwright.async_api import async_playwright
@@ -235,7 +236,8 @@ async def convert_md_str_to_image(md_content, output_image):
     """
     将 Markdown 字符串转换为图片（异步）。
     """
-    temp_html = 'temp_output.html'
+    timestamp = int(time.time())
+    temp_html = f"temp_output_{timestamp}.html"
     md_str_to_html(md_content, temp_html)
     await html_to_image(temp_html, output_image)
     os.remove(temp_html)