fix: 修复代理卡密统计和列表查询逻辑

- 前端使用后端返回的total字段显示总数
- 后端查询条件兼容旧数据(agent_id IS NULL AND creator_id = ?)
- handleGetStats统计接口使用相同查询逻辑

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

backend/internal/router/agent/agent.go

@@ -30,8 +30,9 @@ func handleGetStats(c *gin.Context) {
 	var totalApps int64
 	database.DB.Model(&model.AgentApplication{}).Where("agent_id = ?", userID).Count(&totalApps)
 
+	// 统计卡密数：包括 agent_id 或 creator_id 等于当前用户的卡密
 	var totalCards int64
-	database.DB.Model(&model.Card{}).Where("agent_id = ?", userID).Count(&totalCards)
+	database.DB.Model(&model.Card{}).Where("agent_id = ? OR (agent_id IS NULL AND creator_id = ?)", userID, userID).Count(&totalCards)
 
 	var totalUsers int64
 	var agentApps []model.AgentApplication
@@ -45,22 +46,22 @@ func handleGetStats(c *gin.Context) {
 	}
 
 	var totalRevenue float64
-	database.DB.Model(&model.Card{}).Where("agent_id = ?", userID).Select("COALESCE(SUM(price), 0)").Scan(&totalRevenue)
+	database.DB.Model(&model.Card{}).Where("agent_id = ? OR (agent_id IS NULL AND creator_id = ?)", userID, userID).Select("COALESCE(SUM(price), 0)").Scan(&totalRevenue)
 
 	today := time.Now().Format("2006-01-02")
 	var todayCards int64
-	database.DB.Model(&model.Card{}).Where("agent_id = ? AND DATE(created_at) = ?", userID, today).Count(&todayCards)
+	database.DB.Model(&model.Card{}).Where("(agent_id = ? OR (agent_id IS NULL AND creator_id = ?)) AND DATE(created_at) = ?", userID, userID, today).Count(&todayCards)
 
 	var todayRevenue float64
-	database.DB.Model(&model.Card{}).Where("agent_id = ? AND DATE(created_at) = ?", userID, today).Select("COALESCE(SUM(price), 0)").Scan(&todayRevenue)
+	database.DB.Model(&model.Card{}).Where("(agent_id = ? OR (agent_id IS NULL AND creator_id = ?)) AND DATE(created_at) = ?", userID, userID, today).Select("COALESCE(SUM(price), 0)").Scan(&todayRevenue)
 
 	response.Success(c, gin.H{
 		"totalApps":     totalApps,
-		"totalCards":    totalCards,
-		"totalUsers":    totalUsers,
-		"totalRevenue":  totalRevenue,
-		"todayCards":    todayCards,
-		"todayRevenue":  todayRevenue,
+		"totalCards":   totalCards,
+		"totalUsers":   totalUsers,
+		"totalRevenue": totalRevenue,
+		"todayCards":   todayCards,
+		"todayRevenue": todayRevenue,
 	})
 }
 
@@ -157,8 +158,9 @@ func handleGetCards(c *gin.Context) {
 	page := c.DefaultQuery("page", "1")
 	pageSize := c.DefaultQuery("page_size", "20")
 
+	// 统计总数：包括 agent_id 或 creator_id 等于当前��户的卡密
 	var total int64
-	database.DB.Model(&model.Card{}).Where("agent_id = ?", userID).Count(&total)
+	database.DB.Model(&model.Card{}).Where("agent_id = ? OR (agent_id IS NULL AND creator_id = ?)", userID, userID).Count(&total)
 
 	var cards []model.Card
 	offset := 0
@@ -171,7 +173,8 @@ func handleGetCards(c *gin.Context) {
 		limit = pageSizeInt
 	}
 
-	database.DB.Where("agent_id = ?", userID).Order("created_at DESC").Limit(limit).Offset(offset).Find(&cards)
+	// 查询卡密：包括 agent_id 或 creator_id 等于当前用户的卡密
+	database.DB.Where("agent_id = ? OR (agent_id IS NULL AND creator_id = ?)", userID, userID).Order("created_at DESC").Limit(limit).Offset(offset).Find(&cards)
 
 	// 获取关联数据
 	cardTypeIDs := make([]uint, 0)