管理面板功能完善，注册需要手机号

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

@@ -31,6 +31,9 @@ public class User {
     @Column(nullable = false, length = 128, unique = true)
     private String email;
 
+    @Column(name = "phone_number", length = 32, unique = true)
+    private String phoneNumber;
+
     @Column(name = "password_hash", nullable = false, length = 255)
     private String passwordHash;
 
@@ -108,6 +111,14 @@ public class User {
         this.email = email;
     }
 
+    public String getPhoneNumber() {
+        return phoneNumber;
+    }
+
+    public void setPhoneNumber(String phoneNumber) {
+        this.phoneNumber = phoneNumber;
+    }
+
     public String getPasswordHash() {
         return passwordHash;
     }