修复 python <3.13 字符串报错问题

Author: wyf9

main.py

@@ -84,7 +84,7 @@ def emit(self, record):
 
     l.info(f'Startup Config: {c}')
     l.info(f'Node: {c.node}')
-    l.info(f'{'='*25} Application Startup {'='*25}')
+    l.info(f'{"="*25} Application Startup {"="*25}')
     l.info(f'ImgAPI v{VERSION} by SiiWay Team')
     l.info('Under MIT License')
     l.info('GitHub: https://github.com/siiway/imgapi')