refactor(chat): 欢迎语仅保留账号群配置

backend/internal/modules/systemconfig/repository.go

@@ -45,7 +45,6 @@ var defaultConfigs = []defaultConfig{
 	{Key: rentergrowth.ConfigKey, Value: rentergrowth.DefaultConfigValue(), Description: "租客成长等级规则（积分门槛、租金折扣、等级免押额度）"},
 	{Key: smsnode.ConfigKey, Value: smsnode.DefaultConfigValue(), Description: "节点短信模板配置（总开关、各业务节点模板 CODE）"},
 	{Key: "chat.default_support_admin_id", Value: "2", Description: "默认客服 ID（必须是启用状态的客服角色）"},
-	{Key: "chat.auto_welcome_message", Value: "欢迎加入订单群聊！如有任何问题，请随时沟通。", Description: "建群后自动发送的欢迎话术"},
 	{Key: "chat.listing_group_welcome", Value: "欢迎加入账号群！请号主扫描下方二维码加入企业微信群，方便客服与您及时联系。", Description: "发布群创建后自动发送的欢迎语"},
 	{Key: "chat.renter_retention_days_after_order_end", Value: "5", Description: "订单结束后租客保留在发布群的天数（3-7）"},
 	{Key: "integration.paddle_ocr_token", Value: "", Description: "PaddleOCR API Token，用于二维码群名自动识别"},
@@ -66,7 +65,6 @@ var defaultConfigs = []defaultConfig{
 }
 
 var adminVisibleConfigKeys = []string{
-	"chat.auto_welcome_message",
 	"chat.default_support_admin_id",
 	"chat.listing_group_welcome",
 	"chat.renter_retention_days_after_order_end",