refactor application configuration and update user model with new fields

src/main/java/com/yundage/chat/entity/PasswordResetToken.java

@@ -3,6 +3,7 @@ package com.yundage.chat.entity;
 import com.mybatisflex.annotation.Id;
 import com.mybatisflex.annotation.KeyType;
 import com.mybatisflex.annotation.Table;
+import com.mybatisflex.annotation.Column;
 
 import java.time.LocalDateTime;
 
@@ -12,10 +13,17 @@ public class PasswordResetToken {
     @Id(keyType = KeyType.Auto)
     private Long id;
     
+    @Column("user_id")
     private Long userId;
+    
     private String token;
+    
+    @Column("expires_at")
     private LocalDateTime expiresAt;
+    
     private Boolean used;
+    
+    @Column("created_at")
     private LocalDateTime createdAt;
     
     public PasswordResetToken() {