fix: 修复更名退款逻辑、审核列表显示及更名消耗确认提示

- 首次更名审核被拒不再退款，首次免费未扣费不产生退款
- 审核列表提交者列改用 UID，当前用户名列显示当前用户名
- 更名消耗提示改为确认弹窗，首次/非首次动态显示不同文案

internal/controller/admin/audit_controller.go

@@ -50,17 +50,17 @@ func (ac *AuditController) ListAudits(c *gin.Context) {
 		return
 	}
 
-	// 为每个审核记录附加提交者的用户名
+	// 为每个审核记录附加提交者的当前用户名
 	type auditItem struct {
 		model.AuditSubmission
-		SubmitterUsername string `json:"submitter_username"`
+		CurrentUsername string `json:"current_username"`
 	}
 
 	items := make([]auditItem, 0, len(result.Items))
 	for _, a := range result.Items {
 		item := auditItem{AuditSubmission: a}
 		if user, err := ac.userRepo.FindByID(a.UserID); err == nil {
-			item.SubmitterUsername = user.Username
+			item.CurrentUsername = user.Username
 		}
 		items = append(items, item)
 	}

internal/controller/settings_controller.go

@@ -58,15 +58,23 @@ func (sc *SettingsController) SettingsPage(c *gin.Context) {
 	// 查询待审核类型（用于前端显示审核提示）
 	pendingTypes, _ := sc.auditService.GetPendingTypes(uid)
 
+	// 是否已完成首次改名（用于前端确认弹窗显示消耗提示）
+	hasCompletedRename := false
+	if sc.levelSvc != nil {
+		completed, _ := sc.levelSvc.HasCompletedTask(uid, "username")
+		hasCompletedRename = completed
+	}
+
 	data := gin.H{
-		"Title":        "个人设置",
-		"ExtraCSS":     "/static/css/settings.css",
-		"ActiveTab":    tab,
-		"User":         user,
-		"RoleName":     model.RoleDisplayNames[user.Role],
-		"StatusName":   model.StatusDisplayNames[user.Status],
-		"PendingTypes": pendingTypes,
-		"AuditTypes":   model.AuditTypeNames,
+		"Title":              "个人设置",
+		"ExtraCSS":           "/static/css/settings.css",
+		"ActiveTab":          tab,
+		"User":               user,
+		"RoleName":           model.RoleDisplayNames[user.Role],
+		"StatusName":         model.StatusDisplayNames[user.Status],
+		"PendingTypes":       pendingTypes,
+		"AuditTypes":         model.AuditTypeNames,
+		"HasCompletedRename": hasCompletedRename,
 	}
 
 	// 登录管理 tab 需要额外数据

internal/service/audit_review.go

@@ -45,18 +45,28 @@ func (s *AuditService) review(reviewerID uint, submissionID uint, approved bool,
 	} else {
 		submission.Status = model.AuditStatusRejected
 		submission.RejectReason = &reason
-		// 通知用户审核被拒（改名审核追加域能返还提示）
+
+		// 改名审核被拒 → 仅非首次改名（已扣费）才退还域能
+		// 首次改名免费，被拒不退还
+		shouldRefund := false
+		if submission.AuditType == model.AuditTypeUsername && s.energyRefundSvc != nil {
+			if s.levelSvc != nil {
+				hasCompleted, _ := s.levelSvc.HasCompletedTask(submission.UserID, "username")
+				shouldRefund = hasCompleted
+			}
+			if shouldRefund {
+				_ = s.energyRefundSvc.RefundOnRenameReject(submission.UserID)
+			}
+		}
+
+		// 通知用户审核被拒（仅实际退款时追加域能返还提示）
 		if s.notifier != nil {
 			reasonMsg := reason
-			if submission.AuditType == model.AuditTypeUsername {
+			if shouldRefund {
 				reasonMsg += "。扣除的域能已被返还"
 			}
 			s.notifier.NotifyAuditRejected(submission.UserID, submission.AuditType, reasonMsg, submission.ID)
 		}
-		// 改名审核被拒 → 返还域能
-		if submission.AuditType == model.AuditTypeUsername && s.energyRefundSvc != nil {
-			_ = s.energyRefundSvc.RefundOnRenameReject(submission.UserID)
-		}
 	}
 	return s.auditRepo.Update(submission)
 }

internal/service/audit_service.go

@@ -40,6 +40,7 @@ type auditNotifier interface {
 // auditTaskCompleter 审核通过时触发首次任务奖励的接口
 type auditTaskCompleter interface {
 	CompleteTask(userID uint, taskType string) (newExp int, levelUp bool, err error)
+	HasCompletedTask(userID uint, taskType string) (bool, error)
 }
 
 // energyRenameRefunder 改名审核被拒时返还域能的接口（ISP）