实现快传，完善快传和网盘的功能，实现文件的互传等一系列功能

backend/src/main/java/com/yoyuzh/auth/User.java

@@ -40,12 +40,6 @@ public class User {
     @Column(name = "created_at", nullable = false)
     private LocalDateTime createdAt;
 
-    @Column(name = "last_school_student_id", length = 64)
-    private String lastSchoolStudentId;
-
-    @Column(name = "last_school_semester", length = 64)
-    private String lastSchoolSemester;
-
     @Column(name = "display_name", nullable = false, length = 64)
     private String displayName;
 
@@ -135,22 +129,6 @@ public class User {
         this.createdAt = createdAt;
     }
 
-    public String getLastSchoolStudentId() {
-        return lastSchoolStudentId;
-    }
-
-    public void setLastSchoolStudentId(String lastSchoolStudentId) {
-        this.lastSchoolStudentId = lastSchoolStudentId;
-    }
-
-    public String getLastSchoolSemester() {
-        return lastSchoolSemester;
-    }
-
-    public void setLastSchoolSemester(String lastSchoolSemester) {
-        this.lastSchoolSemester = lastSchoolSemester;
-    }
-
     public String getDisplayName() {
         return displayName;
     }