feat(ui): M6.38批 — P1 MD3细化(SDK对话框28)+批②底部上滑回桌面+批6 ncm顶栏回播放页+批④面板后台列表+launcher UI微调(歌词页黑半透明底/播放页布局下移)+封面空artwork保留修复

- P1: meow_ui_dialog.c 对话框底框 radius_card→MEOW_SHAPE_EXTRA_LARGE(28) 三处(:103填充/:104描边/:361 BottomSheet); meow_ui_widgets.h 新增 MEOW_SHAPE_EXTRA_LARGE 28 宏; TextField/FAB/Slider/Progress 按设计文档保留
- 批②: np_gesture.h 新增 NP_GEST_HOME+np_home_gesture(底部热区上滑,与左缘返回对称互斥); now_playing.c 新增 np_draw_home_bar(屏底左缘pill指示条)+手势衔接; test_now_playing_widgets G5b
- 批6: ncm home.c 顶栏加回播放页按钮(MEOW_ICON_QUEUE_MUSIC)→push(ACT_PLAYER), 无音频也生效
- 批④: meowpanel /api/ams/bg 只读端点+前端后台列表页+杀/清复用kill通道
- UI微调: now_playing.c 播放页布局宏下移(NP_COVER_Y 84/NP_BTN_Y 612消底部留白)+歌词页背景统一黑色半透明叠层(弃封面取色底,删 np_draw_lyric_coverbg)
- 封面保留: now_playing.c/notif_center.c 空artwork保留上一张已解码封面(防暂停/开歌单致META报空artwork后封面闪没); test_np_cover C2断言更新+mirror同步

0warning;宿主测试 test_np_cover ALL PASS;launcher/ncm/panel 宿主测试无回归。二进制留批量批次未入库

patch_v2/meowpanel/web/index.html

@@ -69,6 +69,10 @@
         <span class="nav-ico"><svg viewBox="0 0 24 24"><path d="M4 6h16M4 12h16M4 18h16" stroke="currentColor" stroke-width="2" stroke-linecap="round"/><circle cx="9" cy="6" r="2.2" fill="var(--bg)"/><circle cx="15" cy="12" r="2.2" fill="var(--bg)"/><circle cx="7" cy="18" r="2.2" fill="var(--bg)"/></svg></span>
         <span class="nav-label">进程·服务</span>
       </button>
+      <button class="nav-item" data-route="bg"      title="后台活动（App 后台常驻：CPU/内存占用 + 一键清后台）">
+        <span class="nav-ico"><svg viewBox="0 0 24 24"><path d="M12 3 3 8l9 5 9-5-9-5z" fill="none" stroke="currentColor" stroke-width="2" stroke-linejoin="round"/><path d="M3 12l9 5 9-5" fill="none" stroke="currentColor" stroke-width="2" stroke-linejoin="round"/><path d="M3 16l9 5 9-5" fill="none" stroke="currentColor" stroke-width="2" stroke-linejoin="round"/></svg></span>
+        <span class="nav-label">后台</span>
+      </button>
       <button class="nav-item" data-route="system"  title="系统信息 / 升级">
         <span class="nav-ico"><svg viewBox="0 0 24 24"><rect x="6" y="3" width="12" height="18" rx="2" fill="none" stroke="currentColor" stroke-width="2"/><path d="M9 8h6M9 12h6M9 16h3" stroke="currentColor" stroke-width="2" stroke-linecap="round"/></svg></span>
         <span class="nav-label">系统</span>
@@ -92,6 +96,7 @@
       </button>
       <h1 class="topbar-title" id="page-title">首页仪表盘</h1>
       <div class="topbar-actions">
+        <button class="btn topbar-btn" id="bg-clear" hidden>一键清后台</button>
         <span class="conn" id="conn-dot" data-state="unknown" title="后端连接">
           <span class="conn-dot"></span><span class="conn-text" id="conn-text">检测中…</span>
         </span>

patch_v2/meowpanel/web/meowpanel.css

@@ -171,6 +171,8 @@ body{
 .conn[data-state="bad"] .conn-dot{ background:var(--error); }
 .conn[data-state="ok"]{ color:var(--success); }
 .conn[data-state="bad"]{ color:var(--error); }
+.topbar-actions{ display:flex; align-items:center; gap:8px; }
+.topbar-btn{ padding:6px 12px; font-size:12px; }
 
 /* 内容区 */
 .content{ flex:1; overflow-y:auto; padding:20px; }
@@ -269,6 +271,19 @@ input[type=range]{ width:100%; accent-color:var(--primary); }
 .app-card .app-meta{ font-size:12px; color:var(--on-surface-variant); }
 .app-card .app-actions{ display:flex; gap:6px; margin-top:auto; flex-wrap:wrap; }
 
+/* 后台活动列表（批④，与启动器后台管理页观感呼应：MD3 圆角卡 + 行右杀按钮） */
+.bg-list{ display:flex; flex-direction:column; gap:8px; }
+.bg-row{
+  display:flex; align-items:center; gap:12px;
+  padding:12px 14px; background:var(--surface-variant);
+  border-radius:var(--radius-l); border:var(--outline-w) solid var(--outline-variant);
+}
+.bg-row .bg-ico{ width:40px; height:40px; border-radius:var(--radius-m); background:var(--primary); color:var(--on-primary); display:flex; align-items:center; justify-content:center; font-weight:700; font-size:16px; flex:0 0 40px; }
+.bg-row .bg-info{ flex:1; min-width:0; }
+.bg-row .bg-name{ font-weight:600; }
+.bg-row .bg-sub{ font-size:12px; color:var(--on-surface-variant); margin-top:2px; display:flex; align-items:center; gap:6px; flex-wrap:wrap; }
+.bg-row .btn{ flex:0 0 auto; }
+
 /* 实时屏幕（屏幕页） */
 .screen-frame{ display:flex; justify-content:center; max-width:480px; margin:0 auto; }
 .screen-frame img{

patch_v2/meowpanel/web/meowpanel.js

@@ -3,7 +3,7 @@
 (function () {
   'use strict';
   var MP = window.MP;
-const { $, $$, LOG_GROUP_NAME, SPARK_MAX, api, apiDownload, applyTheme, authMode, authRequired, barHtml, bindLogin, bindPwDlg, bindSlider, bindThemeUi, browserMode, confirmDlg, dbPct, dbg, dbgErr, debounce, deciToDb, devStyleLabel, devThemeLabel, doLogin, drawSpark, emptyState, errText, esc, fmtBytes, fmtDb, fmtTime, fmtUptime, hideLogin, homeCard, homeKv, homeUnavailable, initTheme, isAvail, levelMeterHtml, loginErr, modePill, passwordDlg, pct, pushSpark, refreshAuthGate, resetSpark, resolveMode, resolveStyle, saveSetting, setConn, showLogin, slur, sparkPeak, sparkRms, sparklineHtml, sparklinePoints, stat, state, storageDel, storageGet, storageSet, storedMode, storedStyle, toast, toastTimer, updateLevelMeter, volTimer, absFor, appInfo, appStatePill, appUninstall, applyScreenDeltaDom, audioCard, audioCtlHtml, audioFlowHtml, audioPortName, audioRouteLabel, batteryCard, batteryCardBody, bindApps, bindAudio, bindFiles, bindFonts, bindHome, bindLogs, bindNet, bindNotif, bindPin, bindPower, bindProc, bindScreen, bindSettings, bindSystem, breakdownCardBody, btCard, createImgFromBlob, crumbHtml, deviceCard, doDownload, ensureScreenCanvas, escSafeAttr, estimateCardBody, eventsBar, fetchAudioOnce, fetchHomeLevel, fetchHomeSystem, fetchNetConns, fetchNetLog, fetchNetOnce, fetchOverviewOnce, fetchPerfOnce, fetchPowerOnce, fetchProcOnce, fetchScreen, fmtDur, fmtFrames, groupName, handleRemoteGesture, healthCard, importFont, importFontPage, installFromFile, installFromPath, joinRel, loadFonts, loadFontsPage, loadPinStatus, logsCrashCard, mkdirFile, navFiles, netBadge, netBannerErr, netCard, netConnsBody, netDnsBody, netIfaceCards, netPolicyCard, netStateCls, netStatusCards, newestStdout, perfCard, pinEdit, pinEditDlg, powerEventsCard, powerHistoryCard, powerPolicyCard, powerProfileLabel, powerSummaryCard, pubBytesCard, remoteBtn, remotePadHtml, remotePointerDown, remotePointerUp, removeFile, renameFile, renderApps, renderAudio, renderBright, renderFiles, renderFontsPage, renderHome, renderHomeCards, renderLogs, renderLogsFiles, renderNet, renderNotif, renderPerf, renderPerfData, renderPower, renderPowerBody, renderProc, renderProcBody, renderScreen, renderSettings, renderSystem, restartScreenPoll, row, screenTap, seedScreenCanvas, segments, sendKey, sendKeyLabel, sendKeyRepeat, sendTheme, setBrightCtl, setPanelPassword, settingControl, srcPill, stopAudio, stopHome, stopNet, stopPerf, stopPower, stopProc, stopScreenPoll, storageCard, svcStatePill, uploadFiles, viewAppStdout, viewLogsCrashTail, volSteps } = MP;
+const { $, $$, LOG_GROUP_NAME, SPARK_MAX, api, apiDownload, applyTheme, authMode, authRequired, barHtml, bindLogin, bindPwDlg, bindSlider, bindThemeUi, browserMode, confirmDlg, dbPct, dbg, dbgErr, debounce, deciToDb, devStyleLabel, devThemeLabel, doLogin, drawSpark, emptyState, errText, esc, fmtBytes, fmtDb, fmtTime, fmtUptime, hideLogin, homeCard, homeKv, homeUnavailable, initTheme, isAvail, levelMeterHtml, loginErr, modePill, passwordDlg, pct, pushSpark, refreshAuthGate, resetSpark, resolveMode, resolveStyle, saveSetting, setConn, showLogin, slur, sparkPeak, sparkRms, sparklineHtml, sparklinePoints, stat, state, storageDel, storageGet, storageSet, storedMode, storedStyle, toast, toastTimer, updateLevelMeter, volTimer, absFor, appInfo, appStatePill, appUninstall, applyScreenDeltaDom, audioCard, audioCtlHtml, audioFlowHtml, audioPortName, audioRouteLabel, batteryCard, batteryCardBody, bindApps, bindAudio, bindBg, bindFiles, bindFonts, bindHome, bindLogs, bindNet, bindNotif, bindPin, bindPower, bindProc, bindScreen, bindSettings, bindSystem, breakdownCardBody, btCard, createImgFromBlob, crumbHtml, deviceCard, doDownload, ensureScreenCanvas, escSafeAttr, estimateCardBody, eventsBar, fetchAudioOnce, fetchHomeLevel, fetchHomeSystem, fetchNetConns, fetchNetLog, fetchNetOnce, fetchOverviewOnce, fetchPerfOnce, fetchPowerOnce, fetchProcOnce, fetchScreen, fmtDur, fmtFrames, groupName, handleRemoteGesture, healthCard, importFont, importFontPage, installFromFile, installFromPath, joinRel, loadFonts, loadFontsPage, loadPinStatus, logsCrashCard, mkdirFile, navFiles, netBadge, netBannerErr, netCard, netConnsBody, netDnsBody, netIfaceCards, netPolicyCard, netStateCls, netStatusCards, newestStdout, perfCard, pinEdit, pinEditDlg, powerEventsCard, powerHistoryCard, powerPolicyCard, powerProfileLabel, powerSummaryCard, pubBytesCard, remoteBtn, remotePadHtml, remotePointerDown, remotePointerUp, removeFile, renameFile, renderApps, renderAudio, renderBg, renderBgBody, renderBright, renderFiles, renderFontsPage, renderHome, renderHomeCards, renderLogs, renderLogsFiles, renderNet, renderNotif, renderPerf, renderPerfData, renderPower, renderPowerBody, renderProc, renderProcBody, renderScreen, renderSettings, renderSystem, restartScreenPoll, row, screenTap, seedScreenCanvas, segments, sendKey, sendKeyLabel, sendKeyRepeat, sendTheme, setBrightCtl, setPanelPassword, settingControl, srcPill, stopAudio, stopBg, stopHome, stopNet, stopPerf, stopPower, stopProc, stopScreenPoll, storageCard, svcStatePill, uploadFiles, viewAppStdout, viewLogsCrashTail, volSteps } = MP;
 
   const ROUTES = {
     home: { title: '首页仪表盘', render: renderHome, bind: bindHome },
@@ -20,7 +20,8 @@ const { $, $$, LOG_GROUP_NAME, SPARK_MAX, api, apiDownload, applyTheme, authMode
     logs: { title: '系统日志', render: renderLogs, bind: bindLogs },
     notif: { title: '通知中心', render: renderNotif, bind: bindNotif },
     power: { title: '电源 / 功耗', render: renderPower, bind: bindPower },
-    proc: { title: '进程 / 服务', render: renderProc, bind: bindProc }
+    proc: { title: '进程 / 服务', render: renderProc, bind: bindProc },
+    bg: { title: '后台管理', render: renderBg, bind: bindBg }
   };
   let started = false;
 
@@ -33,7 +34,7 @@ const { $, $$, LOG_GROUP_NAME, SPARK_MAX, api, apiDownload, applyTheme, authMode
     bindNav();
     bindThemeUi();
     bindSlider();
-    bindFiles(); bindApps(); bindFonts(); bindSettings(); bindScreen(); bindSystem(); bindLogs(); bindNotif(); bindNet(); bindHome(); bindProc(); bindPin(); bindAudio();
+    bindFiles(); bindApps(); bindFonts(); bindSettings(); bindScreen(); bindSystem(); bindLogs(); bindNotif(); bindNet(); bindHome(); bindProc(); bindBg(); bindPin(); bindAudio();
     bindLogin();
     bindPwDlg();
     // 首次进入：访问级 PIN 鉴权——已登录直接进；未设 PIN（且无旧密码）→ 首次设置流程；已设 → 登录
@@ -58,8 +59,12 @@ const { $, $$, LOG_GROUP_NAME, SPARK_MAX, api, apiDownload, applyTheme, authMode
     stopHome();
     stopPower();
     stopProc();
+    stopBg();
     $$('.nav-item').forEach(b => b.classList.toggle('active', b.dataset.route === id));
     $('#page-title').textContent = r.title;
+    // 顶栏「一键清后台」仅后台管理页显示（内容由 fetchBgOnce 按数据更新）
+    const bc = $('#bg-clear');
+    if (bc) { bc.hidden = (id !== 'bg'); if (id !== 'bg') bc.disabled = false; }
     r.render();
   }
 

patch_v2/meowpanel/web/mp_pages.js

@@ -885,6 +885,105 @@ const { $, $$, LOG_GROUP_NAME, SPARK_MAX, api, apiDownload, applyTheme, authMode
     });
   }
 
+  /* ---- 批④ 后台活动页（#/bg）：列表 + 行内「杀死」 + 顶栏「一键清后台」（复用 /api/ams/bg 只读 + /api/ams/:pkg/kill） ---- */
+  let bgTimer = null;
+  let bgData = null;   // {available,count,apps:[{pkg,name,pid,state,cpu_pct,rss_kb}]}
+
+  function stopBg() { if (bgTimer) { clearInterval(bgTimer); bgTimer = null; } }
+
+  function bgIconHtml(a) {
+    const ch = esc((a.name || a.pkg || '?').charAt(0).toUpperCase());
+    return '<span class="bg-ico">' + ch + '</span>';
+  }
+
+  function renderBgBody(d) {
+    let h = '<div class="page" id="bg-page">';
+    h += '<div class="card"><h3 class="card-title">后台活动 App（meow_amsd bg · 只读）</h3>';
+    if (!d || d.available === false) {
+      h += homeUnavailable();
+    } else {
+      const apps = d.apps || [];
+      if (!apps.length) {
+        h += '<div class="empty">无后台 App</div>';
+      } else {
+        h += '<div class="bg-list">';
+        apps.forEach(a => {
+          const cpu = (a.cpu_pct == null) ? '—' : a.cpu_pct.toFixed(1) + '%';
+          const mem = (a.rss_kb == null) ? '—' : fmtBytes(Number(a.rss_kb) * 1024);
+          const sub = 'CPU ' + cpu + ' · ' + mem + ' · 后台' +
+            (a.pid > 0 ? ' · pid ' + esc(a.pid) : '');
+          h += '<div class="bg-row">' + bgIconHtml(a) +
+            '<div class="bg-info"><div class="bg-name">' + esc(a.name || a.pkg || '未命名') + '</div>' +
+            '<div class="bg-sub">' + sub + '<span class="mono">' + esc(a.pkg) + '</span></div></div>' +
+            '<button class="btn btn-danger" data-bgkill="' + esc(a.pkg) + '">杀死</button></div>';
+        });
+        h += '</div>';
+      }
+      h += '<p class="muted">占用数据读自 /proc/&lt;pid&gt;（与启动器后台管理页同源、同口径）；「杀死」经 amsd（require_auth）。CPU 首采样为「—」，轮询后显示真实占用；数据不可得时如实显示「—」，绝不编造。</p>';
+    }
+    h += '</div></div>';
+    return h;
+  }
+
+  async function fetchBgOnce() {
+    const el = $('#bg-page');
+    if (!el || state.route !== 'bg') return;
+    let d = null;
+    try { d = await api('GET', '/api/ams/bg'); }
+    catch (e) {
+      if (state.route === 'bg') el.innerHTML = '<div class="page" id="bg-page">' + emptyState('加载失败：' + errText(e), e.code) + '</div>';
+      const bc = $('#bg-clear'); if (bc) bc.disabled = true;
+      return;
+    }
+    if (state.route !== 'bg') return;
+    bgData = d;
+    el.innerHTML = renderBgBody(d);
+    const bc = $('#bg-clear');
+    if (bc) {
+      const n = (d && d.apps && d.apps.length) ? d.apps.length : 0;
+      bc.disabled = !n;
+      bc.textContent = '一键清后台' + (n ? ' (' + n + ')' : '');
+    }
+  }
+
+  function renderBg() {
+    stopBg();
+    $('#content').innerHTML = '<div class="page" id="bg-page"><p class="placeholder">加载后台 App…</p></div>';
+    fetchBgOnce();
+    bgTimer = setInterval(fetchBgOnce, 4000);
+  }
+
+  async function bgKill(pkg) {
+    const ok = await confirmDlg('结束 App', '确认结束后台 App ' + pkg + '？（SIGTERM 语义）', true);
+    if (!ok) return;
+    try { await api('POST', '/api/ams/' + encodeURIComponent(pkg) + '/kill'); toast('已请求结束 ' + pkg); }
+    catch (e) { toast('结束失败：' + errText(e)); }
+    fetchBgOnce();
+  }
+
+  async function bgClearAll() {
+    const list = (bgData && bgData.apps) ? bgData.apps : [];
+    if (!list.length) { toast('无后台 App 可清'); return; }
+    const ok = await confirmDlg('一键清除后台', '将结束 ' + list.length + ' 个后台 App，确认？（SIGTERM 语义）', true);
+    if (!ok) return;
+    let done = 0, fail = 0;
+    for (const a of list) {
+      try { await api('POST', '/api/ams/' + encodeURIComponent(a.pkg) + '/kill'); done++; }
+      catch (e) { fail++; }
+    }
+    toast('已清 ' + done + ' 个后台 App' + (fail ? '，' + fail + ' 个失败' : ''));
+    fetchBgOnce();
+  }
+
+  function bindBg() {
+    $('#content').addEventListener('click', async function (e) {
+      const kl = e.target.closest('[data-bgkill]');
+      if (kl) { await bgKill(kl.dataset.bgkill); return; }
+    });
+    const bc = $('#bg-clear');
+    if (bc) bc.addEventListener('click', bgClearAll);
+  }
+
   function stopNet() { if (netTimer) { clearInterval(netTimer); netTimer = null; } }
 
   function fmtDur(sec) {   // 连接寿命（秒级精度）
@@ -2376,5 +2475,5 @@ const { $, $$, LOG_GROUP_NAME, SPARK_MAX, api, apiDownload, applyTheme, authMode
     });
   }
 
-  Object.assign(MP, { absFor, appInfo, appStatePill, appUninstall, applyScreenDeltaDom, audioCard, audioCtlHtml, audioFlowHtml, audioPortName, audioRouteLabel, batteryCard, batteryCardBody, bindApps, bindAudio, bindFiles, bindFonts, bindHome, bindLogs, bindNet, bindNotif, bindPin, bindPower, bindProc, bindScreen, bindSettings, bindSystem, breakdownCardBody, btCard, createImgFromBlob, crumbHtml, deviceCard, doDownload, ensureScreenCanvas, escSafeAttr, estimateCardBody, eventsBar, fetchAudioOnce, fetchHomeLevel, fetchHomeSystem, fetchNetConns, fetchNetLog, fetchNetOnce, fetchOverviewOnce, fetchPerfOnce, fetchPowerOnce, fetchProcOnce, fetchScreen, fmtDur, fmtFrames, groupName, handleRemoteGesture, healthCard, importFont, importFontPage, installFromFile, installFromPath, joinRel, loadFonts, loadFontsPage, loadPinStatus, logsCrashCard, mkdirFile, navFiles, netBadge, netBannerErr, netCard, netConnsBody, netDnsBody, netIfaceCards, netPolicyCard, netStateCls, netStatusCards, newestStdout, perfCard, pinEdit, pinEditDlg, powerEventsCard, powerHistoryCard, powerPolicyCard, powerProfileLabel, powerSummaryCard, pubBytesCard, remoteBtn, remotePadHtml, remotePointerDown, remotePointerUp, removeFile, renameFile, renderApps, renderAudio, renderBright, renderFiles, renderFontsPage, renderHome, renderHomeCards, renderLogs, renderLogsFiles, renderNet, renderNotif, renderPerf, renderPerfData, renderPower, renderPowerBody, renderProc, renderProcBody, renderScreen, renderSettings, renderSystem, restartScreenPoll, row, screenTap, seedScreenCanvas, segments, sendKey, sendKeyLabel, sendKeyRepeat, sendTheme, setBrightCtl, setPanelPassword, settingControl, srcPill, stopAudio, stopHome, stopNet, stopPerf, stopPower, stopProc, stopScreenPoll, storageCard, svcStatePill, uploadFiles, viewAppStdout, viewLogsCrashTail, volSteps });
+  Object.assign(MP, { absFor, appInfo, appStatePill, appUninstall, applyScreenDeltaDom, audioCard, audioCtlHtml, audioFlowHtml, audioPortName, audioRouteLabel, batteryCard, batteryCardBody, bgClearAll, bgIconHtml, bindBg, bindApps, bindAudio, bindFiles, bindFonts, bindHome, bindLogs, bindNet, bindNotif, bindPin, bindPower, bindProc, bindScreen, bindSettings, bindSystem, breakdownCardBody, btCard, createImgFromBlob, crumbHtml, deviceCard, doDownload, ensureScreenCanvas, escSafeAttr, estimateCardBody, eventsBar, fetchAudioOnce, fetchBgOnce, fetchHomeLevel, fetchHomeSystem, fetchNetConns, fetchNetLog, fetchNetOnce, fetchOverviewOnce, fetchPerfOnce, fetchPowerOnce, fetchProcOnce, fetchScreen, fmtDur, fmtFrames, groupName, handleRemoteGesture, healthCard, importFont, importFontPage, installFromFile, installFromPath, joinRel, loadFonts, loadFontsPage, loadPinStatus, logsCrashCard, mkdirFile, navFiles, netBadge, netBannerErr, netCard, netConnsBody, netDnsBody, netIfaceCards, netPolicyCard, netStateCls, netStatusCards, newestStdout, perfCard, pinEdit, pinEditDlg, powerEventsCard, powerHistoryCard, powerPolicyCard, powerProfileLabel, powerSummaryCard, pubBytesCard, remoteBtn, remotePadHtml, remotePointerDown, remotePointerUp, removeFile, renameFile, renderApps, renderAudio, renderBg, renderBgBody, renderBright, renderFiles, renderFontsPage, renderHome, renderHomeCards, renderLogs, renderLogsFiles, renderNet, renderNotif, renderPerf, renderPerfData, renderPower, renderPowerBody, renderProc, renderProcBody, renderScreen, renderSettings, renderSystem, restartScreenPoll, row, screenTap, seedScreenCanvas, segments, sendKey, sendKeyLabel, sendKeyRepeat, sendTheme, setBrightCtl, setPanelPassword, settingControl, srcPill, stopAudio, stopBg, stopHome, stopNet, stopPerf, stopPower, stopProc, stopScreenPoll, storageCard, svcStatePill, uploadFiles, viewAppStdout, viewLogsCrashTail, volSteps });
 })();