fix(web_order_box): 修复移动端音频和语音播放限制问题

1. 调整响应式布局的最小高度阈值从420px改为300px
2. 添加unlockAudio和unlockSpeech函数，在用户手势上下文解锁浏览器自动播放限制
3. 优化播放逻辑，当音频上下文未解锁时跳过蜂鸣音播放

public/tools/web_order_box/order_box.css

@@ -406,7 +406,7 @@ input[type='number'] { -moz-appearance: textfield; appearance: textfield; }
   margin-top: 0;
 }
 
-@media (orientation: landscape) and (min-height: 420px), (min-width: 900px) {
+@media (orientation: landscape) and (min-height: 300px), (min-width: 900px) {
   .runner-container { padding: 18px 28px; padding-top: calc(12px + env(safe-area-inset-top)); }
   .runner-header { margin-bottom: 10px; }
   .runner-progress { margin-bottom: 12px; }

public/tools/web_order_box/order_box.js

@@ -627,6 +627,9 @@
       updateStaleWarning();
       return;
     }
+    // 必须在 await 之前（用户手势上下文中）解锁音频和语音
+    unlockAudio();
+    unlockSpeech();
     setButtonLoading(btn, '启动中…');
     const res = await runTrackedInteraction('启动执行会话', function () {
       return apiFetch('POST', '/api/app_order_box/kits/motion_reminder/sessions/start', { card: card });
@@ -1061,6 +1064,7 @@
   }
 
   function openRunner(session, card) {
+    unlockAudio(); // 用户手势中解锁音频，确保后续定时器触发的提示音能播放
     const steps = (card && Array.isArray(card.steps)) ? card.steps : [];
     if (!steps.length) {
       showAlert('无法启动', '当前卡片没有可执行步骤');
@@ -1355,6 +1359,17 @@
     } catch (e) { /* 不支持时静默 */ }
   }
 
+  /** 在用户手势中调用，解锁 iOS Safari 的语音合成限制 */
+  function unlockSpeech() {
+    try {
+      if (!('speechSynthesis' in window)) return;
+      const u = new SpeechSynthesisUtterance('');
+      u.volume = 0;
+      window.speechSynthesis.speak(u);
+      window.speechSynthesis.cancel();
+    } catch (e) { /* 静默 */ }
+  }
+
   function stopSpeech() {
     try {
       if ('speechSynthesis' in window) window.speechSynthesis.cancel();
@@ -1384,12 +1399,25 @@
 
   let audioCtx = null;
 
+  /** 在用户手势中调用，解锁 AudioContext（解决浏览器自动播放策略静音问题） */
+  function unlockAudio() {
+    try {
+      const AudioContextCtor = window.AudioContext || window.webkitAudioContext;
+      if (!AudioContextCtor) return;
+      if (!audioCtx) audioCtx = new AudioContextCtor();
+      if (audioCtx.state === 'suspended') {
+        audioCtx.resume().catch(function () {});
+      }
+    } catch (e) { /* 不支持时静默 */ }
+  }
+
   function playBeep() {
     try {
       const AudioContextCtor = window.AudioContext || window.webkitAudioContext;
       if (!AudioContextCtor) return;
       if (!audioCtx) audioCtx = new AudioContextCtor();
-      if (audioCtx.state === 'suspended') { void audioCtx.resume(); }
+      // 如果仍处于 suspended（无用户手势解锁），跳过本次播放
+      if (audioCtx.state === 'suspended') return;
       const osc = audioCtx.createOscillator();
       const gain = audioCtx.createGain();
       osc.type = 'sine';