feat(model): 同步 vivid 最新变更 — 去模型开关,配价即上架

对齐 vivid a338edb / 7fb5c57 / 4f454b6:
- model_configs.enabled 列删除:上架唯一门槛 = 绑定了启用渠道 + 全部档位
  有价(视频另需时长有价)。/v1/models、/api/models、video-presets、
  managed-models 全部改按 sellable 透出
- 保存渠道即全量同步上游模型(消失解绑/孤儿删除/失败告警不删库)
- v1 job 持久化 upstream jobId,重启后维护循环按 jobId 续等不丢单

Generated with [Devin](https://devin.ai)

Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

backend/internal/http/handler/user_generation.go

@@ -461,7 +461,7 @@ func (h *UserGenerationHandler) VideoPresets(c *gin.Context) {
 	}
 	out := make([]gin.H, 0, len(models))
 	for _, m := range models {
-		if m.Type != "video" || !m.Enabled {
+		if m.Type != "video" {
 			continue
 		}
 		out = append(out, modelPreset(m))
@@ -547,7 +547,7 @@ func (h *UserGenerationHandler) catalogEntries(c *gin.Context) ([]gin.H, error)
 }
 
 // publicModels — GET /api/models for the public site (docs/landing pickers).
-// Enabled models only, in the same shape as before minus the provider id.
+// Fully-priced models only (配价即上架), same shape as before.
 func (h *UserGenerationHandler) publicModels(c *gin.Context) ([]gin.H, error) {
 	models, err := h.admin.Models(c.Request.Context())
 	if err != nil {
@@ -555,7 +555,8 @@ func (h *UserGenerationHandler) publicModels(c *gin.Context) ([]gin.H, error) {
 	}
 	items := make([]gin.H, 0, len(models))
 	for _, m := range models {
-		if !m.Enabled {
+		// 配价即上架：未配齐价的模型对前台不可见（绑定/配价都满足才进 /v1）。
+		if !service.ModelFullyPriced(&m) {
 			continue
 		}
 		items = append(items, gin.H{