fix: 模型列表仅显示已启用渠道中的模型

server/internal/channel/channel.go

@@ -87,6 +87,20 @@ func (s *Service) loadBound(bindings []store.ChannelModelBinding) []Candidate {
 	return out
 }
 
+// AvailableModelIDs 返回对外可见的模型 ID：启用的模型且至少绑定到一个启用且健康的渠道。
+// 与 Candidates 的过滤口径一致（enabled + health_status=healthy），避免暴露绑定到已停用渠道的模型。
+func (s *Service) AvailableModelIDs() []uint64 {
+	var ids []uint64
+	s.db.Model(&store.ChannelModelBinding{}).
+		Joins("JOIN channels ON channels.id = channel_model_bindings.channel_id").
+		Joins("JOIN models ON models.id = channel_model_bindings.model_id").
+		Where("channels.enabled = ? AND channels.health_status = ?", true, store.ChannelHealthHealthy).
+		Where("models.enabled = ?", true).
+		Distinct("channel_model_bindings.model_id").
+		Pluck("channel_model_bindings.model_id", &ids)
+	return ids
+}
+
 // Pick 按权重加权随机选一个候选渠道（负载均衡）。
 func (s *Service) Pick(cands []Candidate) *store.Channel {
 	if len(cands) == 0 {