添加注释，优化代码，减少魔法值

src/main/java/com/bao/dating/controller/PostController.java

@@ -13,6 +13,11 @@ import org.springframework.web.multipart.MultipartFile;
 
 import java.util.List;
 
+/**
+ * 动态接口
+ *
+ * @author KilLze
+ */
 @RestController
 @RequestMapping("/posts")
 public class PostController {