fix @Import duplicate registration and add JavaFX demo test

- Fix @Import processing to skip already registered beans from package scan
- Add extractBeanName helper method for bean name extraction
- Set MainController to PROTOTYPE scope to avoid eager initialization
- Add FxDemoTest for testing JavaFX components without GUI
- Test configuration beans, services, and dependency injection
- All JavaFX demo components tested successfully

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

src/main/java/com/imyeyu/inject/TimiInject.java

@@ -132,9 +132,20 @@ public class TimiInject {
                     throw new InjectException("Failed to instantiate module: " + importClass.getName(), e);
                 }
             } else {
-                scanner.processClass(importClass);
-                log.debug("Imported configuration: {}", importClass.getName());
+                // 检查是否已经通过包扫描注册
+                String beanName = extractBeanName(importClass);
+                if (!context.containsBean(beanName)) {
+                    scanner.processClass(importClass);
+                    log.debug("Imported configuration: {}", importClass.getName());
+                } else {
+                    log.debug("Skip importing already registered class: {}", importClass.getName());
+                }
             }
         }
     }
+
+    private static String extractBeanName(Class<?> clazz) {
+        String simpleName = clazz.getSimpleName();
+        return Character.toLowerCase(simpleName.charAt(0)) + simpleName.substring(1);
+    }
 }