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

@@ -58,6 +58,13 @@ 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",
@@ -67,6 +74,7 @@ func (sc *SettingsController) SettingsPage(c *gin.Context) {
 		"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）

templates/MetaLab-2026/html/settings/index.html

@@ -79,7 +79,7 @@
                 <div class="info-row">
                     <span class="info-label">用户名</span>
                     <span class="info-value">
-                        <input type="text" id="usernameInput" class="settings-text-input" value="{{.User.Username}}" maxlength="16" autocomplete="off">
+                        <input type="text" id="usernameInput" class="settings-text-input" value="{{.User.Username}}" maxlength="16" autocomplete="off" data-has-completed-rename="{{.HasCompletedRename}}">
                         <span class="char-counter" id="usernameCounter"></span>
                     </span>
                 </div>
@@ -375,6 +375,7 @@
         // ---- 原始值（用于判断是否变更） ----
         var origUsername = usernameInput.value.trim();
         var origBio = bioInput.value;
+        var hasCompletedRename = usernameInput.getAttribute('data-has-completed-rename') === 'true';
 
         // 与后端一致的合法字符集：中文、英文大小写、数字、下划线、连字符
         var usernameRe = /^[\u4e00-\u9fffa-zA-Z0-9_-]+$/;
@@ -409,6 +410,21 @@
                 return;
             }
 
+            // 用户名有变更时弹出消耗确认
+            if (username !== origUsername) {
+                var confirmMsg = hasCompletedRename
+                    ? '确认修改用户名？\n\n本次将消耗 6 域能，是否继续？'
+                    : '确认修改用户名？\n\n首次更名无需消耗域能。';
+                showConfirm('修改用户名', confirmMsg).then(function(ok) {
+                    if (ok) doSave(username, bio);
+                });
+                return;
+            }
+
+            doSave(username, bio);
+        });
+
+        function doSave(username, bio) {
             btn.disabled = true;
             btn.textContent = '保存中...';
 
@@ -434,7 +450,7 @@
                 }
             };
             xhr.send(JSON.stringify({ username: username, bio: bio }));
-        });
+        }
 
     // ---- 头像裁切上传 ----
     var avatarWrap = document.getElementById('avatarWrap');

templates/admin/static/js/audit.js

@@ -149,8 +149,8 @@ function renderTable(items, bodyId) {
 function renderUsernameRow(item) {
     return `
         <tr>
-            <td>${escapeHtml(item.submitter_username || '—')}</td>
-            <td>—</td>
+            <td>${item.user_id || '—'}</td>
+            <td>${escapeHtml(item.current_username || '—')}</td>
             <td><strong>${escapeHtml(item.new_value)}</strong></td>
             <td>${formatTime(item.created_at)}</td>
             <td class="col-actions">
@@ -165,7 +165,7 @@ function renderBioRow(item) {
     const display = text.length > 40 ? text.substring(0, 40) + '...' : text;
     return `
         <tr>
-            <td>${escapeHtml(item.submitter_username || '—')}</td>
+            <td>${item.user_id || '—'}</td>
             <td title="${escapeHtml(text)}">${escapeHtml(display)}</td>
             <td>${formatTime(item.created_at)}</td>
             <td class="col-actions">
@@ -188,7 +188,7 @@ function renderAvatarCards(items) {
     grid.innerHTML = items.map(item => `
         <div class="avatar-audit-card">
             <div class="card-header">
-                <span>提交者: <strong>${escapeHtml(item.submitter_username || '—')}</strong></span>
+                <span>提交者: <strong>${item.user_id || '—'}</strong></span>
                 <span>${formatTime(item.created_at)}</span>
             </div>
             <div class="avatar-compare">
@@ -224,7 +224,7 @@ function renderHistoryTable(items) {
         return `
             <tr>
                 <td>${typeLabel}</td>
-                <td>${escapeHtml(item.submitter_username || '—')}</td>
+                <td>${item.user_id || '—'}</td>
                 <td>${escapeHtml(content)}</td>
                 <td><span class="audit-status-tag ${statusClass}">${statusLabel}</span></td>
                 <td>${escapeHtml(reviewer)}</td>