refactor(video): 使用@Autowired注解简化依赖注入

- 移除了构造函数注入方式
- 添加了@Autowired注解实现字段注入
- 简化了VModelMapper的依赖管理
- 提高了代码可读性和维护性

ruoyi-video/src/main/java/com/ruoyi/video/service/impl/VModelServiceImpl.java

@@ -3,6 +3,7 @@ package com.ruoyi.video.service.impl;
 import com.ruoyi.video.domain.VModel;
 import com.ruoyi.video.mapper.VModelMapper;
 import com.ruoyi.video.service.IVModelService;
+import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Service;
 
 import java.util.List;
@@ -11,11 +12,9 @@ import java.util.Map;
 @Service
 public class VModelServiceImpl implements IVModelService {
 
-    private final VModelMapper mapper;
+    @Autowired
+    private VModelMapper mapper;
 
-    public VModelServiceImpl(VModelMapper mapper) {
-        this.mapper = mapper;
-    }
 
     @Override
     public int insert(VModel model) {