feat: veo3.1 拆分 fast/standard, seedance双模型, per_second定价, 子号过滤, 随机种子, UI优化

frontend/src/views/AccountsView.vue

@@ -453,6 +453,9 @@ onMounted(() => { loadAccounts(); loadModelList() })
                    case. -->
               <div class="flex items-center gap-2 min-w-0">
                 <span class="text-sm text-white/90 truncate" :title="a.email || '-'">{{ a.email || '-' }}</span>
+                <span v-if="a.sub_account"
+                      class="shrink-0 inline-flex items-center rounded px-1.5 py-0.5 text-[10px] font-medium bg-sky-500/15 text-sky-300 ring-1 ring-sky-400/20"
+                      :title="'子号 (剩余 ' + (a.remaining ?? '—') + ' 积分)'">子号</span>
                 <span v-if="a.image_limited && a.status !== 'quota'"
                       class="shrink-0 inline-flex items-center rounded px-1.5 py-0.5 text-[10px] font-medium bg-amber-500/15 text-amber-300 ring-1 ring-amber-400/20"
                       title="图片额度耗尽，仅视频可用">图片限额</span>

frontend/src/views/PlaygroundView.vue

@@ -725,7 +725,7 @@ onUnmounted(() => {
       <!-- reference images -->
       <div v-if="maxRefs > 0">
         <label class="block text-xs font-medium text-slate-500 mb-1.5">
-          参考图
+          {{ refMode === 'frame' && mode === 'video' ? '首尾帧' : '参考图' }}
           <span class="text-slate-400 font-normal">
             (最多 {{ maxRefs }} 张{{ refMode === 'frame' && mode === 'video' ? (maxRefs >= 2 ? ' · 首帧/末帧' : ' · 首帧') : '' }} · 单张 ≤20MB)
           </span>