Refactor controller, service; improve Dashboard layout

.gitlab-ci.yml

.idea/encodings.xml

README.md

...csui/advpro2021/practice5/controller/GuildController.java

.../java/csui/advpro2021/practice5/service/GuildService.java

...a/csui/advpro2021/practice5/service/GuildServiceImpl.java

practice-8/.gitignore

practice-8/README.md

practice-8/build.gradle

practice-8/gradle/wrapper/gradle-wrapper.jar

practice-8/gradle/wrapper/gradle-wrapper.properties

practice-8/gradlew

practice-8/gradlew.bat

practice-8/settings.gradle

...n/java/csui/adpro2021/practice8/Practice8Application.java

...a/csui/adpro2021/practice8/controller/MainController.java

.../csui/adpro2021/practice8/controller/OrderController.java

...n/java/csui/adpro2021/practice8/model/OrderItemModel.java

.../main/java/csui/adpro2021/practice8/model/OrderModel.java

...java/csui/adpro2021/practice8/model/dto/ItemModelDTO.java