fix(docs): 修复甘特图示例中的部署时间配置

- 将Production Deployment的时间从1d改为0d以修正里程碑设置

skills/mermaid/examples/gantt.md

@@ -143,7 +143,7 @@ gantt
     Unit Testing :test1, after front1 back1, 15d
     Integration Testing :test2, after test1, 10d
     section Deployment
-    Production Deployment :milestone, deploy1, after test2, 1d
+    Production Deployment :milestone, deploy1, after test2, 0d
 ```
 
 ### Alternative (Flowchart - compatible with all Mermaid versions)