feat(workbench): 添加 SpringContext工具类并初始化上下文

- 新增 SpringContext 类，用于存储 Spring 应用上下文
- 在 StartWorkbench 中初始化 SpringContext.HOLDER
- 优化代码格式，调整缩进和换行

servo/src/main/java/com/yvan/workbench/SpringContext.java

@@ -0,0 +1,11 @@
+package com.yvan.workbench;
+
+import org.springframework.context.ApplicationContext;
+
+/**
+ * 作者：lizw <br/>
+ * 创建时间：2025/07/01 13:25 <br/>
+ */
+public class SpringContext {
+    public static ApplicationContext HOLDER;
+}

servo/src/main/java/com/yvan/workbench/StartWorkbench.java

@@ -26,6 +26,6 @@ public class StartWorkbench {
     public static void main(String[] args) {
         System.setProperty("polyglot.engine.WarnInterpreterOnly", "false");
         SpringApplication application = new SpringApplication(StartWorkbench.class);
-        application.run(args);
+        SpringContext.HOLDER = application.run(args);
     }
 }