Initial commit: audio2text 双语字幕生成服务

- 音频/视频转双语(英/中)SRT 字幕，Docker 容器化，CPU 开发/GPU 生产同一份代码
- faster-whisper ASR(词级时间戳) + 断句时间戳重算 + NLLB 翻译(模型不共驻)
- 分片上传(断点续传) + SQLite 持久化 + 主页/历史/日志页面
- 历史页文件名搜索；缓存定时清理(默认保留7天，可配置)
- 双 Dockerfile(cpu/gpu) + setup/start/stop 脚本

app/views/home_html.py

@@ -0,0 +1,142 @@
+"""主页：上传入口 + 最近 10 个任务的实时进度。
+
+共享 _shared.py 的 BASE_CSS / SHARED_JS / 上传协议 JS。
+页面专属：refreshList（拉取最近任务）、makeTaskCard、pollTask（轮询进行中任务）。
+"""
+
+from __future__ import annotations
+
+from ._shared import POLL_INTERVAL, render_page, render_upload_js
+
+RECENT_LIMIT = 10
+LIST_REFRESH_INTERVAL = 5000
+
+_PAGE_JS = f"""
+const POLL_INTERVAL = {POLL_INTERVAL};
+const LIST_REFRESH_INTERVAL = {LIST_REFRESH_INTERVAL};
+const RECENT_LIMIT = {RECENT_LIMIT};
+
+const tasksEl = document.getElementById("tasks");
+const emptyEl = document.getElementById("empty");
+let pollingIds = new Set();
+
+// 初始化上传区
+initUpload(document.getElementById("drop"), document.getElementById("file-input"), tasksEl);
+
+// ==================== 最近任务列表 ====================
+
+async function refreshList() {{
+  try {{
+    const r = await fetch("/api/tasks?limit=" + RECENT_LIMIT);
+    if (!r.ok) return;
+    const data = await r.json();
+    renderTasks(data.tasks);
+  }} catch (e) {{}}
+}}
+
+function renderTasks(tasks) {{
+  tasksEl.querySelectorAll(".server-task").forEach(el => el.remove());
+  const hasUploadCards = tasksEl.querySelector(".upload-task") !== null;
+  emptyEl.style.display = (tasks.length === 0 && !hasUploadCards) ? "block" : "none";
+
+  for (const task of tasks) {{
+    tasksEl.appendChild(makeTaskCard(task));
+  }}
+  // 对进行中的任务启动轮询
+  for (const task of tasks) {{
+    if (ACTIVE_STATES.includes(task.status) && !pollingIds.has(task.id)) {{
+      pollingIds.add(task.id);
+      pollTask(task.id);
+    }}
+  }}
+}}
+
+function downloadLinks(taskId) {{
+  return `<a href="/api/tasks/${{taskId}}/subtitle?type=bilingual" class="dl">双语 SRT</a>`
+    + ` <a href="/api/tasks/${{taskId}}/subtitle?type=en" class="dl">英</a>`
+    + ` <a href="/api/tasks/${{taskId}}/subtitle?type=zh" class="dl">中</a>`;
+}}
+
+function makeTaskCard(task) {{
+  const el = document.createElement("div");
+  el.className = "card task server-task";
+  el.dataset.taskId = task.id;
+  el.innerHTML = renderTaskInner(task);
+  return el;
+}}
+
+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();
+
+  let body;
+  if (task.status === "done") {{
+    body = `<div class="task-meta"><b>完成</b> · ${{downloadLinks(task.id)}}</div>`;
+  }} else if (task.status === "failed") {{
+    body = `<div class="task-meta fail-msg">${{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>`;
+  }}
+  return `
+    <div class="task-head">
+      <span class="fname">#${{task.id}} ${{escapeHtml(task.filename)}}</span>
+      <span class="fstate ${{stateClass}}">${{label}}</span>
+    </div>
+    ${{body}}
+    <div class="task-time">${{created}}</div>`;
+}}
+
+async function pollTask(taskId) {{
+  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; }}
+
+      card.innerHTML = renderTaskInner(task);
+
+      if (task.status === "done" || task.status === "failed") {{
+        pollingIds.delete(taskId);
+        return;
+      }}
+      setTimeout(tick, POLL_INTERVAL);
+    }} catch (e) {{
+      setTimeout(tick, POLL_INTERVAL);
+    }}
+  }};
+  tick();
+}}
+
+// 启动
+refreshList();
+setInterval(refreshList, LIST_REFRESH_INTERVAL);
+"""
+
+_BODY = """
+<h1>音频转字幕</h1>
+<p class="sub">上传视频或音频文件，自动生成双语（英/中）SRT 字幕。支持大文件分片上传与断点续传。</p>
+
+<div id="drop" class="drop">
+  <p class="drop-hint">把文件拖到这里，或</p>
+  <label class="btn">选择文件<input id="file-input" type="file" multiple hidden></label>
+</div>
+
+<h2>最近任务</h2>
+<div id="tasks" class="tasks"></div>
+<div id="empty" class="empty" style="display:none">暂无任务，上传文件后这里会显示进度。</div>
+"""
+
+
+def render() -> str:
+    # 上传完成后刷新任务列表，让新任务出现在卡片中
+    upload_js = render_upload_js(on_complete="refreshList();")
+    return render_page(
+        title="audio2text — 音频转字幕",
+        nav_active="home",
+        body=_BODY,
+        page_js=upload_js + _PAGE_JS,
+    )