refactor(core): 移除不必要的导入依赖

- 删除 WeChatController 中冗余的 RequestMapping 导入
- 移除 UserBindingTypeHandler 中未使用的 MetaObjectHandler 导入

src/main/java/work/baiyun/chronicdiseaseapp/controller/WeChatController.java

@@ -4,7 +4,6 @@ import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.http.MediaType;
 import org.springframework.web.bind.annotation.PostMapping;
 import org.springframework.web.bind.annotation.RequestBody;
-import org.springframework.web.bind.annotation.RequestMapping;
 import org.springframework.web.bind.annotation.RestController;
 import io.swagger.v3.oas.annotations.Operation;
 import io.swagger.v3.oas.annotations.tags.Tag;

src/main/java/work/baiyun/chronicdiseaseapp/handler/UserBindingTypeHandler.java

@@ -1,6 +1,5 @@
 package work.baiyun.chronicdiseaseapp.handler;
 
-import com.baomidou.mybatisplus.core.handlers.MetaObjectHandler;
 import org.apache.ibatis.type.BaseTypeHandler;
 import org.apache.ibatis.type.JdbcType;
 import org.apache.ibatis.type.MappedJdbcTypes;