feat: 调度器+并发管线+GPU优化+日志分级+前端修复

- scheduler: ffmpeg 异步线程 + GPU 串行调度 + 模型复用（2N→2 次加载）
- pipeline: 阶段拆分（extract/asr/translate），中间数据存 Task 字段
- translate_service: 长度排序批处理，padding 浪费减少 91%
- model_manager: ASR/翻译不共驻，BatchedInferencePipeline 批量解码
- 日志分级: INFO=任务流转里程碑，DEBUG=进度详情；默认 INFO
- 前端: 日志最新在上+滚动感知+退避轮询；24h 时间；上传中状态显示
- /health: 返回完整 Whisper/NLLB 配置
- upload_service: 单事务 complete + 扩展名白名单
- task_router: 合并 UploadSession 虚拟任务到列表
- Dockerfile: CPU/GPU 独立构建链，deps 缓存稳定
- prefetch_models: 安装时预下载模型权重

app/views/home_html.py

@@ -42,12 +42,13 @@ function renderTasks(tasks) {{
   for (const task of tasks) {{
     tasksEl.appendChild(makeTaskCard(task));
   }}
-  // 对进行中的任务启动轮询
+  // 对进行中的任务启动轮询（上传会话用 upload_id 去重，Task 用 id 去重）
   for (const task of tasks) {{
-    if (ACTIVE_STATES.includes(task.status) && !pollingIds.has(task.id)) {{
-      pollingIds.add(task.id);
-      pollTask(task.id);
-    }}
+    if (!ACTIVE_STATES.includes(task.status)) continue;
+    const pollKey = task.is_upload ? task.upload_id : String(task.id);
+    if (pollingIds.has(pollKey)) continue;
+    pollingIds.add(pollKey);
+    pollTask(task);
   }}
 }}
 
@@ -61,6 +62,7 @@ function makeTaskCard(task) {{
   const el = document.createElement("div");
   el.className = "card task server-task";
   el.dataset.taskId = task.id;
+  if (task.is_upload) el.dataset.uploadId = task.upload_id;
   el.innerHTML = renderTaskInner(task);
   return el;
 }}
@@ -69,7 +71,11 @@ function renderTaskInner(task) {{
   const label = STATUS_LABEL[task.status] || task.status;
   const stateClass = task.status === "done" ? "state-done"
     : task.status === "failed" ? "state-fail" : "state-running";
-  const created = new Date(task.created_at).toLocaleString();
+
+  // 上传中：created_at 可能是 naive UTC，前端按 UTC 解析
+  let created;
+  try {{ created = fmtDateTime24(new Date(task.created_at + "Z")); }}
+  catch (e) {{ created = task.created_at; }}
 
   let body;
   if (task.status === "done") {{
@@ -77,35 +83,72 @@ function renderTaskInner(task) {{
   }} else if (task.status === "failed") {{
     body = `<div class="task-meta fail-msg">${{escapeHtml(task.error || "未知错误")}}</div>`;
   }} else {{
-    body = `<div class="bar"><div class="fill" style="width:${{task.progress}}%"></div><span class="pct">${{task.progress.toFixed(0)}}%</span></div>`;
+    const pct = (task.progress == null) ? 0 : task.progress;
+    const sizeInfo = task.size_bytes ? ` · ${{fmtBytes(task.size_bytes)}}` : "";
+    body = `<div class="bar"><div class="fill" style="width:${{pct}}%"></div><span class="pct">${{pct.toFixed(0)}}%${{sizeInfo}}</span></div>`;
   }}
   return `
     <div class="task-head">
-      <span class="fname">#${{task.id}} ${{escapeHtml(task.filename)}}</span>
+      <span class="fname">${{task.is_upload ? "" : "#" + task.id + " "}}${{escapeHtml(task.filename)}}</span>
       <span class="fstate ${{stateClass}}">${{label}}</span>
     </div>
     ${{body}}
     <div class="task-time">${{created}}</div>`;
 }}
 
-async function pollTask(taskId) {{
+async function pollTask(task) {{
+  // 上传会话：轮询 upload status 接口；Task：轮询 task 接口
+  const isUpload = task.is_upload === true && task.upload_id;
+  const url = isUpload
+    ? "/api/tasks/chunk-uploads/" + task.upload_id + "/status"
+    : "/api/tasks/" + task.id;
+  let backoff = POLL_INTERVAL;
   const tick = async () => {{
     try {{
-      const r = await fetch("/api/tasks/" + taskId);
-      if (!r.ok) {{ pollingIds.delete(taskId); return; }}
-      const task = await r.json();
-      const card = tasksEl.querySelector('.server-task[data-task-id="' + taskId + '"]');
-      if (!card) {{ pollingIds.delete(taskId); return; }}
+      const r = await fetch(url);
+      if (!r.ok) {{ pollingIds.delete(task.id); pollingIds.delete(task.upload_id); return; }}
+      const data = await r.json();
 
-      card.innerHTML = renderTaskInner(task);
-
-      if (task.status === "done" || task.status === "failed") {{
-        pollingIds.delete(taskId);
-        return;
+      if (isUpload) {{
+        // 上传会话：complete 后 task_id 出现，切换为 Task 轮询
+        if (data.completed && data.task_id) {{
+          pollingIds.delete(task.upload_id);
+          pollingIds.add(data.task_id);
+          pollTask({{ id: data.task_id, is_upload: false }});
+          // 刷新列表让新 Task 卡片出现
+          refreshList();
+          return;
+        }}
+        // 更新上传进度
+        const card = tasksEl.querySelector('.server-task[data-upload-id="' + task.upload_id + '"]');
+        if (!card) {{ pollingIds.delete(task.upload_id); return; }}
+        const uploaded = (data.uploaded_chunks || []).length;
+        const total = data.total_chunks || 1;
+        const pct = Math.min(4, uploaded / total * 4);
+        const fakeTask = {{
+          status: "uploading", progress: pct, is_upload: true,
+          upload_id: task.upload_id, filename: data.filename,
+          size_bytes: data.size_bytes, created_at: task.created_at,
+        }};
+        card.innerHTML = renderTaskInner(fakeTask);
+        backoff = POLL_INTERVAL;
+        setTimeout(tick, backoff);
+      }} else {{
+        // Task 轮询
+        const card = tasksEl.querySelector('.server-task[data-task-id="' + task.id + '"]');
+        if (!card) {{ pollingIds.delete(task.id); return; }}
+        card.innerHTML = renderTaskInner(data);
+        if (data.status === "done" || data.status === "failed") {{
+          pollingIds.delete(task.id);
+          return;
+        }}
+        backoff = POLL_INTERVAL;
+        setTimeout(tick, backoff);
       }}
-      setTimeout(tick, POLL_INTERVAL);
     }} catch (e) {{
-      setTimeout(tick, POLL_INTERVAL);
+      // 网络错误：指数退避，上限 30s
+      backoff = Math.min(backoff * 1.6, 30000);
+      setTimeout(tick, backoff);
     }}
   }};
   tick();