chore: remove unused validation

server/src/models/User.ts

@@ -60,13 +60,6 @@ User.init(
         proxy_username: {
             type: DataTypes.STRING,
             allowNull: true,
-            // validate: {
-            //     isProxyPasswordRequired(value: string | null) {
-            //         if (value && !this.proxy_password) {
-            //             throw new Error('Proxy password is required when proxy username is provided');
-            //         }
-            //     },
-            // },
         },
         proxy_password: {
             type: DataTypes.STRING,