refactor(auth): use legacy md5 password flow

app/api/service/AuthService.php

@@ -45,11 +45,6 @@ class AuthService
             throw new \Exception('账号已过期，请联系客服续费', 4003);
         }
 
-        // 密码升级：旧MD5格式自动升级为bcrypt
-        if (strlen($member->password) === 32) {
-            $member->upgradePassword($password);
-        }
-
         // 记录登录日志
         $member->logLogin(true, 'password');
 
@@ -97,7 +92,7 @@ class AuthService
         // 创建用户
         $member = new Member();
         $member->username = $username;
-        $member->password = password_hash($password, PASSWORD_DEFAULT);
+        $member->password = Member::makePassword($password);
         $member->email = $email;
         $member->formtypeid = $formtypeid ?? 0;
         $member->v_type = 0; // 默认套餐
@@ -195,7 +190,7 @@ class AuthService
             throw new \Exception('原密码错误', 4007);
         }
 
-        $member->password = password_hash($newPassword, PASSWORD_DEFAULT);
+        $member->password = Member::makePassword($newPassword);
         return $member->save();
     }
 }