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

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

frontend/src/views/HomeView.vue

@@ -42,7 +42,7 @@ async function refresh() {
       api('/showcase'),
     ])
     stats.value = s.data || { generated_count: 0, recent: [] }
-    managed.value = (m.data?.data || []).filter((x) => x.enabled !== false)
+    managed.value = (m.data?.data || []).filter((x) => x.sellable)
     showcase.value = sc.data?.data || { hero: [], bento: [], work: [] }
     const top3 = (showcase.value.hero || []).slice(0, 3)
     const sameSet = heroDeck.value.length === top3.length
@@ -92,7 +92,7 @@ const avgLabel = computed(() => {
   return Math.round(avgElapsed.value / 1000) + 's'
 })
 
-// ---- capability cards, derived from the enabled models ----
+// ---- capability cards, derived from the sellable models ----
 function refs(m) { return m.image_to_image === true || Number(m.max_reference_images || 0) > 0 }
 const durationRange = computed(() => {
   const secs = []