diff --git a/index.html b/index.html
index 690572d..f3c9955 100644
--- a/index.html
+++ b/index.html
@@ -4,7 +4,7 @@
 <meta charset="UTF-8"><meta name="viewport" content="width=device-width,initial-scale=1,viewport-fit=cover"><title>AM Downloader</title>
 <style>
 *{box-sizing:border-box}body{margin:0;background:#0b1220;color:#e7edf7;font:14px system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}.wrap{max-width:1100px;margin:auto;padding:20px 16px 80px}.top{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:18px}.brand{font-size:24px;font-weight:850}.brand b{color:#10b981}.sub,.muted{color:#8492a7}.sub{margin-top:4px;font-size:12px}.nav{display:flex;gap:6px;background:#101a2b;border:1px solid #22304a;border-radius:14px;padding:5px}.nav button{border:0;background:transparent;color:#9aa8bb;padding:9px 13px;border-radius:10px;cursor:pointer;font-weight:650}.nav button.active{background:#1c2b42;color:#fff}.badge{display:inline-flex;min-width:19px;height:19px;align-items:center;justify-content:center;border-radius:10px;background:#10b981;color:#06251b;font-size:11px;margin-left:5px}.view{display:none}.view.active{display:block}.hero{padding:44px 8px 34px;text-align:center}.hero h1{font-size:34px;margin:0 0 10px}.hero p{color:#8492a7;margin:0 0 24px}.searchbar{display:flex;max-width:720px;margin:auto;gap:8px}.input{width:100%;padding:12px 13px;border-radius:11px;border:1px solid #2a3852;background:#0c1525;color:#fff;outline:none}.input:focus{border-color:#10b981}.btn{border:0;border-radius:11px;padding:11px 16px;background:#10b981;color:#06251b;font-weight:750;cursor:pointer;white-space:nowrap}.btn.alt{background:#1b2940;color:#dbe5f2}.btn:disabled{opacity:.5;cursor:not-allowed}.card{background:#111b2c;border:1px solid #22304a;border-radius:17px;padding:18px;margin-bottom:15px}.section-head{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:13px}.title{font-size:17px;font-weight:780}.toolbar{display:flex;gap:8px;align-items:center}.result{display:grid;grid-template-columns:50px minmax(0,1fr) auto;gap:12px;align-items:center;padding:10px;border-radius:12px}.result:hover{background:#162238}.cover{width:50px;height:50px;border-radius:10px;object-fit:cover;background:#1b2638}.name{font-weight:700;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.meta{font-size:12px;color:#8492a7;margin-top:4px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.results{display:grid;gap:3px}.empty{text-align:center;padding:42px 12px;color:#8492a7}.loadmore{width:100%;margin-top:12px}.task-tabs{display:flex;gap:6px;overflow:auto;margin-bottom:14px}.task-tabs button{border:1px solid #283750;background:#0e1829;color:#aab6c7;border-radius:10px;padding:8px 12px;white-space:nowrap}.task-tabs button.active{background:#1c2b42;color:#fff}.status{font-size:12px;padding:5px 8px;border-radius:8px;background:#1c2a40}.done{color:#34d399}.error{color:#fb7185}.progress{height:5px;background:#1b2940;border-radius:4px;margin-top:8px;overflow:hidden}.progress i{display:block;height:100%;background:#10b981}.settings-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:15px}.setting-card h3{margin:0 0 5px;font-size:15px}.setting-card p{margin:0 0 15px;color:#8492a7;font-size:12px}.field{margin-top:12px}.field label{display:block;color:#9aa8bb;font-size:12px;margin-bottom:6px}.row{display:flex;gap:9px}.row>*{min-width:0;flex:1}.notice{padding:10px 12px;background:#0d1728;border:1px solid #23314a;border-radius:10px;color:#9eacc0;font-size:12px;margin-top:12px}.recent{margin-top:4px}.mobile-nav{display:none}.quality-select{max-width:132px}.file-info{display:flex;flex-wrap:wrap;gap:6px;margin-top:6px}.chip{display:inline-flex;align-items:center;padding:3px 7px;border-radius:7px;background:#17243a;color:#b9c6d8;font-size:11px}.chip.actual{color:#d9fbe9;background:#123126}.chip.warn{color:#fde7b0;background:#352b16}
-@media(max-width:720px){.wrap{padding:14px 12px 132px}.top{align-items:flex-start}.top .nav{display:none}.hero{padding:35px 4px 25px}.hero h1{font-size:28px}.searchbar{flex-wrap:wrap}.searchbar .input{flex-basis:100%}.searchbar select,.searchbar button{flex:1}.settings-grid{grid-template-columns:1fr}.result{grid-template-columns:42px minmax(0,1fr);gap:10px;padding:10px 6px}.cover{width:42px;height:42px}.result .toolbar{grid-column:2;display:flex;width:100%;gap:7px;margin-top:4px}.result .quality-select{max-width:none;min-width:0;flex:1}.result .toolbar .btn{padding:9px 14px;min-width:76px}.mobile-nav{position:fixed;left:10px;right:10px;bottom:max(10px,env(safe-area-inset-bottom));display:grid;grid-template-columns:repeat(4,1fr);gap:4px;padding:5px;background:#111b2c;border:1px solid #2a3852;border-radius:16px;z-index:10}.mobile-nav button{border:0;background:transparent;color:#8492a7;padding:9px 4px;border-radius:11px;font-size:12px}.mobile-nav button.active{background:#1c2b42;color:#fff}.row{flex-wrap:wrap}.row>*{flex-basis:100%}}
+@media(max-width:720px){.wrap{padding:14px 12px 132px}.top{align-items:flex-start}.top .nav{display:none}.hero{padding:35px 4px 25px}.hero h1{font-size:28px}.searchbar{flex-wrap:wrap}.searchbar .input{flex-basis:100%}.searchbar select,.searchbar button{flex:1}.settings-grid{grid-template-columns:1fr}.result{grid-template-columns:42px minmax(0,1fr);gap:10px;padding:10px 6px}.cover{width:42px;height:42px}.result .toolbar{grid-column:2;display:flex;width:100%;gap:7px;margin-top:4px}.result .quality-select{max-width:none;min-width:0;flex:1}.result .toolbar .btn{padding:9px 14px;min-width:76px}.mobile-nav{position:fixed;left:10px;right:10px;bottom:max(10px,env(safe-area-inset-bottom));display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:3px;padding:5px;background:#111b2c;border:1px solid #2a3852;border-radius:16px;z-index:10}.mobile-nav button{border:0;background:transparent;color:#8492a7;padding:9px 4px;border-radius:11px;font-size:12px}.mobile-nav button.active{background:#1c2b42;color:#fff}.row{flex-wrap:wrap}.row>*{flex-basis:100%}}
 .authbar{display:flex;align-items:center;gap:8px;justify-content:flex-end;margin:-8px 0 14px}.userpill{padding:7px 10px;border:1px solid #22304a;border-radius:10px;background:#111b2c;color:#b9c6d8}.login-overlay{position:fixed;inset:0;background:#0b1220;z-index:50;display:flex;align-items:center;justify-content:center;padding:20px}.login-box{width:min(390px,100%);background:#111b2c;border:1px solid #22304a;border-radius:18px;padding:24px}.login-box h2{margin:0 0 6px}.login-box p{color:#8492a7;font-size:12px;margin:0 0 18px}.login-box .field{margin-top:12px}.login-error{color:#fb7185;font-size:12px;margin-top:10px;min-height:16px}
 .user-groups{display:grid;gap:16px}.user-group{border:1px solid var(--line);border-radius:14px;padding:14px;background:rgba(255,255,255,.02)}.group-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:10px}.group-list{display:grid;gap:8px}.user-row{align-items:center}.user-row .toolbar{display:flex;gap:6px;flex-wrap:wrap}.user-row .meta{line-height:1.55}</style>
 </head>
@@ -17,7 +17,7 @@
 <section id="account" class="view"><div class="settings-grid"><div class="card setting-card"><h3>账户与积分</h3><p>积分用于新的实际下载；失败会自动退回。</p><div class="notice" id="creditPanel">加载中…</div><div class="field"><label>兑换码</label><input id="redeemCode" class="input" placeholder="XXXX-XXXX-XXXX"><button id="redeemBtn" class="btn" style="margin-top:9px">兑换积分</button></div></div><div id="userDavCard" class="card setting-card"><h3>我的 WebDAV</h3><p>仅 privileged / admin 可配置。密码不会回显。</p><div class="field"><label>地址</label><input id="userDavUrl" class="input"></div><div class="row"><input id="userDavUser" class="input" placeholder="用户名"><input id="userDavPass" type="password" class="input" placeholder="新密码（留空不修改）"></div><div class="field"><label>根目录</label><input id="userDavRoot" class="input" placeholder="Music"></div><div class="row" style="margin-top:12px"><button id="testUserDav" class="btn alt">测试</button><button id="saveUserDav" class="btn">保存</button></div></div></div></section>
 <section id="admin" class="view"><div class="card"><div class="section-head"><div><div class="title">用户管理</div><div class="muted">创建账号、分配角色、启用或禁用。</div></div></div><div class="row"><input id="newUser" class="input" placeholder="用户名"><input id="newPass" type="password" class="input" placeholder="初始密码（8+）"><select id="newRole" class="input"><option value="user">user</option><option value="privileged">privileged</option><option value="admin">admin</option></select><input id="newCredits" class="input" type="number" min="0" value="0" placeholder="积分"><button id="createUser" class="btn">创建</button></div><div class="user-groups" id="users" style="margin-top:14px"></div></div><div class="card"><div class="section-head"><div><div class="title">兑换码批次</div><div class="muted">生成后明文兑换码仅在创建结果中返回。</div></div></div><div class="row"><input id="batchCredits" class="input" type="number" min="1" value="10" placeholder="每码积分"><input id="batchCount" class="input" type="number" min="1" max="10000" value="10" placeholder="数量"><input id="batchNote" class="input" placeholder="备注"><button id="createBatch" class="btn">生成兑换码</button></div><pre id="batchOutput" class="notice" style="white-space:pre-wrap;max-height:220px;overflow:auto"></pre><div id="batches"></div></div><div class="card"><div class="section-head"><div class="title">审计日志</div><button id="loadAudit" class="btn alt">刷新</button></div><div id="audit" class="muted"></div></div></section>
 <section id="settings" class="view"><div class="settings-grid"><div class="card setting-card"><h3>音乐 API</h3><p>用于搜索和解析音乐资源，与 Downloader Web 服务分离。</p><div class="field"><label>API 地址</label><input id="amApi" class="input" placeholder="http://127.0.0.1:9530"></div><div class="notice">当前服务架构：Downloader Web 使用 9540，音乐 API 使用 9530。</div></div><div class="card setting-card"><h3>下载</h3><p>设置文件保存位置与默认音质。</p><div class="field"><label>本地下载目录</label><input id="downloadDir" class="input"></div><div class="field"><label>本地文件策略</label><select id="localFilePolicy" class="input"><option value="keep">保留本地文件</option><option value="delete_after_upload">WebDAV 上传成功后删除本地文件</option></select><div class="notice">仅在 WebDAV 上传成功或远端已存在相同大小文件后删除本地成品；上传失败不会删除。</div></div><div class="field"><label>默认下载品质</label><select id="defaultQuality" class="input"><option value="standard">标准</option><option value="exhigh">高品质</option><option value="lossless">无损</option><option value="hires">Hi-Res</option><option value="sky">Sky</option><option value="jyeffect">高清音效</option><option value="jymaster">母带</option><option value="atmos">Atmos</option><option value="atmos_plus">Atmos+</option><option value="master">Master</option></select></div></div><div class="card setting-card"><h3>WebDAV</h3><p>可选的 NAS/远程音乐库同步配置。</p><div class="field"><label>WebDAV 地址</label><input id="davUrl" class="input" placeholder="https://nas.example.com/dav/music"></div><div class="row"><div class="field"><label>用户名</label><input id="davUser" class="input"></div><div class="field"><label>密码</label><input id="davPass" type="password" class="input"></div></div><div class="field"><label>远程音乐目录</label><input id="davPath" class="input" placeholder="Music"></div><div class="field"><label>同曲不同音质</label><select id="davVersionPolicy" class="input"><option value="keep">保留所有版本</option><option value="replace_lower">高音质下载后清理旧低音质</option></select><div class="notice">“清理旧低音质”只删除数据库中已确认属于同一首歌、且音质低于当前版本的旧 WebDAV 文件，不会扫描或删除未知文件。</div></div><div class="row" style="margin-top:15px"><button id="testDav" type="button" class="btn alt">测试连接</button><button id="saveSettings" type="button" class="btn">保存设置</button></div></div></div></section>
-</main><nav class="mobile-nav" id="mobileNav"><button data-view="home">⌂<br>首页</button><button data-view="search">⌕<br>搜索</button><button data-view="queue">♫ <span id="mobileBadge">0</span><br>下载</button><button data-view="account">◎<br>账户</button><button data-view="settings">⚙<br>设置</button></nav></div>
+</main><nav class="mobile-nav" id="mobileNav"><button data-view="home">⌂<br>首页</button><button data-view="search">⌕<br>搜索</button><button data-view="queue">♫ <span id="mobileBadge">0</span><br>下载</button><button data-view="account">◎<br>账户</button><button id="mobileAdminNav" data-view="admin" style="display:none">⚙<br>管理</button><button data-view="settings">⚙<br>设置</button></nav></div>
 <script>
 const $=id=>document.getElementById(id);let searchPage=1,searchKeyword='',searchSource='kw',searchLoading=false,hasMore=false,taskFilter='all';
 async function api(u,o){const r=await fetch('/api'+u,o);if(r.status===401){showLogin();throw new Error('请先登录')}if(!r.ok)throw new Error(await r.text());return r.status===204?null:r.json()}
@@ -33,7 +33,7 @@ async function resetUserPassword(id){const pass=prompt('输入新密码（至少
 async function revokeBatch(id){await api('/admin/redeem/'+id+'/revoke',{method:'POST'});loadAdmin()}
 
 function hideLogin(){document.getElementById('loginOverlay').style.display='none'}
-async function initAuth(){try{const x=await api('/auth/me');const u=x.user;window.currentUser=u;window.isAdmin=u.role==='admin';document.getElementById('userPill').textContent=u.username+' · '+u.role;document.getElementById('settings').style.display=u.role==='admin'?'':'none';document.getElementById('adminNav').style.display=u.role==='admin'?'':'none';document.querySelectorAll('[data-view=\"settings\"]').forEach(x=>x.style.display=u.role==='admin'?'':'none');const c=await api('/credits');document.getElementById('userPill').textContent=u.username+' · '+u.role+' · 积分 '+c.balance+' / 可用 '+c.available;hideLogin();return true}catch(e){showLogin();return false}}
+async function initAuth(){try{const x=await api('/auth/me');const u=x.user;window.currentUser=u;window.isAdmin=u.role==='admin';document.getElementById('userPill').textContent=u.username+' · '+u.role;document.getElementById('settings').style.display=u.role==='admin'?'':'none';document.getElementById('adminNav').style.display=u.role==='admin'?'':'none';document.getElementById('mobileAdminNav').style.display=u.role==='admin'?'':'none';document.querySelectorAll('[data-view=\"settings\"]').forEach(x=>x.style.display=u.role==='admin'?'':'none');const c=await api('/credits');document.getElementById('userPill').textContent=u.username+' · '+u.role+' · 积分 '+c.balance+' / 可用 '+c.available;hideLogin();return true}catch(e){showLogin();return false}}
 $('loginForm').addEventListener('submit',async e=>{e.preventDefault();$('loginError').textContent='登录中…';try{const x=await fetch('/api/auth/login',{method:'POST',headers:{'Content-Type':'application/json'},body:JSON.stringify({username:$('loginUser').value.trim(),password:$('loginPass').value})});if(!x.ok)throw new Error('用户名或密码错误');await initAuth();go(location.hash.slice(1)||'home');loadRecent();loadAccount()}catch(e){$('loginError').textContent=e.message}});
 $('logoutBtn').addEventListener('click',async()=>{try{await api('/auth/logout',{method:'POST'})}finally{showLogin()}});
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