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