feat:对课程展示，作业信息等进行缓存，减轻数据库压力

src/main/java/com/njuzr/eaibackend/EaiBackendApplication.java

@@ -1,15 +1,11 @@
 package com.njuzr.eaibackend;
 
-import com.njuzr.eaibackend.config.OssConfig;
-import org.apache.ibatis.annotations.Mapper;
-import org.mybatis.spring.annotation.MapperScan;
 import org.springframework.boot.SpringApplication;
-import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.cache.annotation.EnableCaching;
 
 @SpringBootApplication
-//@EnableAutoConfiguration
-//@MapperScan("com.njuzr.eaibackend.mapper")
+@EnableCaching
 public class EaiBackendApplication {
 
     public static void main(String[] args) {