Revert "-移除user的identification, 同步修改registerApi"

This reverts commit 93a105a620b00128880424ceb857074489cc9c1a.

Reason for revert: mapper文件未修改

Change-Id: I0807ebc414508cda4dbc0893975e356923979f8d
diff --git a/src/main/java/edu/bjtu/groupone/backend/BackendApplication.java b/src/main/java/edu/bjtu/groupone/backend/BackendApplication.java
index e60b1d5..1cc2086 100644
--- a/src/main/java/edu/bjtu/groupone/backend/BackendApplication.java
+++ b/src/main/java/edu/bjtu/groupone/backend/BackendApplication.java
@@ -15,4 +15,5 @@
     public static void main(String[] args) {
         SpringApplication.run(BackendApplication.class, args);
     }
+
 }