feat(dashboard): 新增音频播放器及决策类型筛选功能

- 在L2审核面板新增音频播放器组件，实现播放、进度条、时间显示等交互
- 音频播放器支持多个实例，点击播放按钮互斥播放
- 页面布局中拆分详情为粘性区域和可滚动区域，更好展示新入库歌词和召回候选音频
- 后端接口增强，返回查询和候选音频URL数据支持前端播放
- 决策过滤条件扩展，支持l1命中、l2重复、l2审核、冲突、新歌、跳过等更多分类
- 更新筛选逻辑和选项标签，提升用户筛选灵活性和准确性

@@ -115,9 +115,100 @@
 
     .content {
       overflow: auto;
+      padding: 0;
+    }
+
+    .sticky-info {
+      position: sticky;
+      top: 0;
+      z-index: 3;
+      background: var(--bg);
+      padding: 14px 18px 0;
+    }
+
+    .scroll-detail {
       padding: 14px 18px 24px;
     }
 
+    .audio-player {
+      display: flex;
+      align-items: center;
+      gap: 10px;
+      padding: 8px 10px;
+      background: #fbfcfd;
+      border: 1px solid var(--line);
+      border-radius: 8px;
+      margin-top: 10px;
+    }
+
+    .audio-player .play-btn {
+      width: 30px;
+      height: 30px;
+      border-radius: 50%;
+      background: var(--accent);
+      color: #fff;
+      border: none;
+      font-size: 16px;
+      display: inline-flex;
+      align-items: center;
+      justify-content: center;
+      cursor: pointer;
+      flex: none;
+      padding: 0;
+    }
+
+    .audio-player .play-btn:hover:not(:disabled) {
+      opacity: 0.85;
+    }
+
+    .audio-player.disabled .play-btn {
+      background: #c8d0d9;
+      cursor: not-allowed;
+    }
+
+    .audio-player.disabled .audio-progress-bar {
+      background: #eef1f4;
+    }
+
+    .audio-player.disabled .audio-time {
+      color: #aab4bf;
+    }
+
+    .audio-progress-wrap {
+      flex: 1;
+      display: flex;
+      flex-direction: column;
+      gap: 2px;
+      min-width: 0;
+    }
+
+    .audio-progress-bar {
+      width: 100%;
+      height: 6px;
+      border-radius: 3px;
+      background: #e4e8ed;
+      cursor: pointer;
+      position: relative;
+      overflow: hidden;
+    }
+
+    .audio-progress-bar .filled {
+      height: 100%;
+      background: var(--accent);
+      border-radius: 3px;
+      width: 0%;
+      transition: width 0.15s linear;
+    }
+
+    .audio-time {
+      font-size: 12px;
+      color: var(--muted);
+      white-space: nowrap;
+      flex: none;
+      min-width: 80px;
+      text-align: right;
+    }
+
     .section {
       margin-bottom: 14px;
       background: var(--panel);
@@ -447,6 +538,7 @@
       main { grid-template-columns: 1fr; height: auto; }
       aside { border-right: 0; border-bottom: 1px solid var(--line); max-height: 420px; }
       .detail-grid, .lyrics-grid { grid-template-columns: 1fr; }
+      .sticky-info { position: relative; padding: 10px; }
       header { height: auto; min-height: 56px; flex-wrap: wrap; padding: 10px; }
       .toolbar { flex-wrap: wrap; }
     }
@@ -460,13 +552,15 @@
       <select id="runSelect"></select>
       <label id="topKLabel" for="topKSelect">topK</label>
       <select id="topKSelect"></select>
-      <label for="decisionFilter">决策</label>
+      <label for="decisionFilter">类型</label>
       <select id="decisionFilter">
         <option value="">全部</option>
-        <option value="new">new</option>
-        <option value="merge">merge</option>
-        <option value="review">review</option>
-        <option value="skip">skip</option>
+        <option value="l1_hit">L1 命中</option>
+        <option value="l2_duplicate">L2 重复</option>
+        <option value="l2_review">L2 审核</option>
+        <option value="conflict">L1/L2 冲突</option>
+        <option value="new">新歌</option>
+        <option value="skip">已跳过</option>
       </select>
       <input id="searchInput" type="search" placeholder="搜索歌名 / ID">
       <label for="pageSizeSelect">每页</label>
@@ -511,7 +605,8 @@
     </aside>
 
     <section class="content">
-      <div id="detail"></div>
+      <div id="stickyInfo" class="sticky-info"></div>
+      <div id="scrollDetail" class="scroll-detail"></div>
     </section>
   </main>
 
@@ -550,7 +645,8 @@
       metrics: document.getElementById('metrics'),
       sampleCount: document.getElementById('sampleCount'),
       queryList: document.getElementById('queryList'),
-      detail: document.getElementById('detail')
+      detail: document.getElementById('scrollDetail'),
+      stickyInfo: document.getElementById('stickyInfo')
     };
 
     function esc(value) {
@@ -680,6 +776,7 @@
         els.queryList.innerHTML = '<div class="empty">没有样本</div>';
         state.queryId = '';
         state.queryRows = [];
+        els.stickyInfo.innerHTML = '';
         renderDetail();
         return;
       }
@@ -781,9 +878,74 @@
       deleted: '已删除',
     };
 
+    function fmtDuration(sec) {
+      if (!sec || !isFinite(sec)) return '0:00';
+      const m = Math.floor(sec / 60);
+      const s = Math.floor(sec % 60);
+      return `${m}:${s.toString().padStart(2, '0')}`;
+    }
+
+    function audioPlayerHtml(id, url) {
+      const disabled = !url;
+      return `
+        <div class="audio-player${disabled ? ' disabled' : ''}" id="${id}Player">
+          <button class="play-btn" id="${id}PlayBtn" ${disabled ? 'disabled' : ''}>&#9654;</button>
+          <div class="audio-progress-wrap">
+            <div class="audio-progress-bar" id="${id}ProgressBar"><div class="filled" id="${id}ProgressFilled"></div></div>
+          </div>
+          <span class="audio-time" id="${id}Time">${disabled ? '无音频' : '0:00 / 0:00'}</span>
+          ${url ? `<audio id="${id}El" preload="metadata" src="${esc(url)}"></audio>` : ''}
+        </div>`;
+    }
+
+    function bindAudioPlayer(id) {
+      const audioEl = document.getElementById(`${id}El`);
+      const playBtn = document.getElementById(`${id}PlayBtn`);
+      const progressBar = document.getElementById(`${id}ProgressBar`);
+      const progressFilled = document.getElementById(`${id}ProgressFilled`);
+      const audioTime = document.getElementById(`${id}Time`);
+      if (!audioEl || !playBtn) return;
+      const pauseAllAudio = () => {
+        for (const el of document.querySelectorAll('.audio-player audio')) {
+          el.pause();
+          const btn = el.closest('.audio-player').querySelector('.play-btn');
+          if (btn) btn.innerHTML = '&#9654;';
+        }
+      };
+      audioEl.addEventListener('loadedmetadata', () => {
+        audioTime.textContent = `0:00 / ${fmtDuration(audioEl.duration)}`;
+      });
+      playBtn.addEventListener('click', () => {
+        if (audioEl.paused) {
+          pauseAllAudio();
+          audioEl.play();
+          playBtn.innerHTML = '&#9646;&#9646;';
+        } else {
+          audioEl.pause();
+          playBtn.innerHTML = '&#9654;';
+        }
+      });
+      audioEl.addEventListener('timeupdate', () => {
+        const pct = audioEl.duration ? (audioEl.currentTime / audioEl.duration) * 100 : 0;
+        progressFilled.style.width = `${pct}%`;
+        audioTime.textContent = `${fmtDuration(audioEl.currentTime)} / ${fmtDuration(audioEl.duration)}`;
+      });
+      audioEl.addEventListener('ended', () => {
+        playBtn.innerHTML = '&#9654;';
+        progressFilled.style.width = '0%';
+      });
+      progressBar.addEventListener('click', (e) => {
+        if (!audioEl.duration) return;
+        const rect = progressBar.getBoundingClientRect();
+        const ratio = (e.clientX - rect.left) / rect.width;
+        audioEl.currentTime = ratio * audioEl.duration;
+      });
+    }
+
     async function renderDetail() {
       const rows = selectedQueryRows();
       if (!rows.length) {
+        els.stickyInfo.innerHTML = '';
         els.detail.innerHTML = '<div class="empty">选择一个样本查看详情</div>';
         return;
       }
@@ -800,8 +962,11 @@
       const selectedReview = candidate ? getReview(candidate) : {};
       const conflict = candidate ? isConflict(candidate) : false;
       const l1 = candidate ? l1Match(candidate) : false;
+      const queryAudioUrl = query.audio_url || '';
+      const candidateAudioUrl = candidate?.candidate_audio_url || '';
 
-      els.detail.innerHTML = `
+      // Sticky area: 新入库歌词 + 召回候选（各含音频播放器）
+      els.stickyInfo.innerHTML = `
         <div class="detail-grid">
           <div class="section">
             <div class="section-head">
@@ -815,6 +980,7 @@
                 <div>作曲</div><div>${esc(query.query_composer || '-')}</div>
                 <div>歌词</div><div class="path">${fmtPath(query.query_lyrics_path)}</div>
               </div>
+              ${audioPlayerHtml('queryAudio', queryAudioUrl)}
             </div>
           </div>
           <div class="section">
@@ -831,10 +997,13 @@
                 <div>L1</div><div>${l1 ? '<span class="pill l1">元数据命中</span>' : '<span class="pill">未命中</span>'} ${conflict ? '<span class="pill conflict">L1/L2 冲突</span>' : ''}</div>
                 <div>歌词</div><div class="path">${fmtPath(candidatePath)}</div>
               </div>
+              ${audioPlayerHtml('candAudio', candidateAudioUrl)}
             </div>
           </div>
-        </div>
+        </div>`;
 
+      // Scrollable area: 人工标注 + Top5候选 + 歌词对比
+      els.detail.innerHTML = `
         <div class="section">
           <div class="section-head">
             <h2 class="section-title">人工标注</h2>
@@ -881,6 +1050,9 @@
           </div>
         </div>`;
 
+      bindAudioPlayer('queryAudio');
+      bindAudioPlayer('candAudio');
+
       for (const card of els.detail.querySelectorAll('.candidate')) {
         card.addEventListener('click', () => {
           state.candidateId = card.dataset.candidateId;

@@ -163,6 +163,7 @@ def _staging_dashboard_row(row: dict[str, object]) -> dict[str, str]:
         "reviewed_at": str(row.get("reviewed_at") or ""),
         "l1_metadata_match": "1" if row.get("l1_matched_id") else "0",
         "l1_l2_conflict": "0",
+        "audio_url": str(row.get("audio_url") or ""),
     }
 
 
@@ -176,8 +177,21 @@ def _staging_groups_response(mode: str, term: str, page: int, page_size: int, de
     # hits 模式下只展示有命中的记录（merge/review）
     if mode == "hits":
         where_clauses.append("dedup_action IN ('merge', 'review')")
-    # 决策筛选：new / merge / review / skip
-    if decision and decision in ('new', 'merge', 'review', 'skip'):
+    # 决策筛选：l1_hit / l2_hit / conflict / new / skip
+    if decision == 'l1_hit':
+        where_clauses.append("l1_matched_id IS NOT NULL")
+    elif decision == 'l2_duplicate':
+        where_clauses.append("dedup_action = 'merge'")
+    elif decision == 'l2_review':
+        where_clauses.append("dedup_action = 'review'")
+    elif decision == 'conflict':
+        where_clauses.append("(l1_matched_id IS NOT NULL AND dedup_action = 'new') OR (l1_matched_id IS NULL AND dedup_action IN ('merge', 'review'))")
+    elif decision == 'new':
+        where_clauses.append("dedup_action = 'new' AND l1_matched_id IS NULL")
+    elif decision == 'skip':
+        where_clauses.append("dedup_action = 'skip'")
+    # 兼容旧的 dedup_action 筛选
+    elif decision and decision in ('merge', 'review'):
         where_clauses.append("dedup_action = %s")
         params.append(decision)
     where = "WHERE " + " AND ".join(where_clauses) if where_clauses else ""
@@ -242,14 +256,14 @@ def _staging_query_rows(query_id: str) -> dict[str, object]:
         if matched_song_id:
             # 先尝试目标表查找（matched_id 是目标库 ID 的情况）
             cursor.execute(
-                f"SELECT name, lyricist, composer, lyrics_url FROM {TARGET_TABLE_NAME} WHERE id = %s",
+                f"SELECT name, lyricist, composer, lyrics_url, audio_url FROM {TARGET_TABLE_NAME} WHERE id = %s",
                 (matched_song_id,),
             )
             matched_row = cursor.fetchone()
             # 目标表找不到时，回退到暂存表查找（同批次内匹配，matched_id 是源库 source_song_id）
             if not matched_row:
                 cursor.execute(
-                    f"SELECT name, lyricist, composer, lyrics_url FROM {TARGET_TABLE_NAME_TMP}"
+                    f"SELECT name, lyricist, composer, lyrics_url, audio_url FROM {TARGET_TABLE_NAME_TMP}"
                     f" WHERE source_song_id = %s ORDER BY staging_id DESC LIMIT 1",
                     (str(matched_song_id),),
                 )
@@ -266,6 +280,7 @@ def _staging_query_rows(query_id: str) -> dict[str, object]:
         if cand_lyrics and not cand_lyrics.startswith(("http://", "https://", "/")):
             cand_lyrics = f"_raw:{cand_lyrics}"
         dashboard_row["candidate_lyrics_path"] = cand_lyrics
+        dashboard_row["candidate_audio_url"] = str(matched_row.get("audio_url") or "")
 
     rows = [dashboard_row]
 
@@ -295,7 +310,7 @@ def _staging_query_rows(query_id: str) -> dict[str, object]:
                 with _target_conn() as tconn, tconn.cursor() as tcursor:
                     # 目标表查找
                     tcursor.execute(
-                        f"SELECT id, name, lyricist, composer, lyrics_url"
+                        f"SELECT id, name, lyricist, composer, lyrics_url, audio_url"
                         f" FROM {TARGET_TABLE_NAME} WHERE id IN ({placeholders})",
                         recalled_ids_int,
                     )
@@ -306,7 +321,7 @@ def _staging_query_rows(query_id: str) -> dict[str, object]:
                     if missing_ids:
                         ph2 = ",".join(["%s"] * len(missing_ids))
                         tcursor.execute(
-                            f"SELECT source_song_id, name, lyricist, composer, lyrics_url"
+                            f"SELECT source_song_id, name, lyricist, composer, lyrics_url, audio_url"
                             f" FROM {TARGET_TABLE_NAME_TMP}"
                             f" WHERE source_song_id IN ({ph2})"
                             f" ORDER BY staging_id DESC",
@@ -336,11 +351,13 @@ def _staging_query_rows(query_id: str) -> dict[str, object]:
                     if cand_lyrics and not cand_lyrics.startswith(("http://", "https://", "/")):
                         cand_lyrics = f"_raw:{cand_lyrics}"
                     cand_row["candidate_lyrics_path"] = cand_lyrics
+                    cand_row["candidate_audio_url"] = str(target_info.get("audio_url") or "")
                 else:
                     cand_row["candidate_name"] = str(cand.get("name") or "")
                     cand_row["candidate_lyricist"] = str(cand.get("lyricist") or "")
                     cand_row["candidate_composer"] = str(cand.get("composer") or "")
                     cand_row["candidate_lyrics_path"] = ""
+                    cand_row["candidate_audio_url"] = ""
                 cand_row["candidate_decision"] = str(cand.get("decision") or "new")
                 cand_row["candidate_confidence"] = str(cand.get("confidence") or "")
                 cand_row["candidate_jaccard"] = str(cand.get("jaccard") or "")
@@ -642,8 +659,20 @@ def _groups_response(path: Path, top_k: str, mode: str, term: str, page: int, pa
     if mode == "hits":
         groups = [g for g in groups if g.get("has_hit")]
     # 决策筛选
-    if decision and decision in ('new', 'merge', 'review', 'duplicate', 'skip'):
-        groups = [g for g in groups if g.get("decision") == decision or (decision == 'merge' and g.get("decision") == 'merge')]
+    if decision == 'l1_hit':
+        groups = [g for g in groups if g.get("has_l1_hint")]
+    elif decision == 'l2_duplicate':
+        groups = [g for g in groups if g.get("decision") == "merge"]
+    elif decision == 'l2_review':
+        groups = [g for g in groups if g.get("decision") == "review"]
+    elif decision == 'conflict':
+        groups = [g for g in groups if g.get("has_conflict")]
+    elif decision == 'new':
+        groups = [g for g in groups if g.get("decision") == "new" and not g.get("has_l1_hint")]
+    elif decision == 'skip':
+        groups = [g for g in groups if g.get("decision") == "skip"]
+    elif decision and decision in ('merge', 'review', 'duplicate'):
+        groups = [g for g in groups if g.get("decision") == decision]
     filtered = [group for group in groups if _matches_term(group, term)]
     start = max(0, (page - 1) * page_size)
     end = start + page_size