fix: @MapperScan 扩展至 com.train.cfc.mapper，修复 CfcActivityMapper bean 找不到导致的启动报错

train-backend/src/main/java/com/train/TrainApplication.java

@@ -7,7 +7,7 @@ import org.springframework.scheduling.annotation.EnableScheduling;
 
 @SpringBootApplication
 @EnableScheduling
-@MapperScan("com.train.mapper")
+@MapperScan({"com.train.mapper", "com.train.cfc.mapper"})
 public class TrainApplication {
 
     public static void main(String[] args) {