feat(voice): configurable user voice-recognition time (bargeInMs, default 700ms)

Expose the barge-in sustained-speech threshold as a dashboard bot setting
"유저 음성 인식 시간" (ms). Server clamps 0..5000, persists via state_store,
and the bot reads it each report round-trip; WSAI_BARGE_IN_MS/700 stays the
fallback default.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

wsai/dashboard.py

@@ -1162,6 +1162,10 @@ PAGE = r"""<!DOCTYPE html>
     <div id="botcfgBody" style="display:none">
       <label class="cfgrow"><input type="checkbox" id="cfgBargeIn" checked>
         <span>유저 목소리 들을 때 봇이 말하던 것 중지 <b class="cfghint">(기본: 켜짐)</b></span></label>
+      <label class="cfgrow"><span>유저 음성 인식 시간
+        <input type="number" id="cfgBargeInMs" min="0" max="5000" step="50" value="700"
+          style="width:80px;margin:0 4px"> ms
+        <b class="cfghint">(이 시간 이상 말해야 봇이 멈춤 · 기본: 700)</b></span></label>
     </div>
   </section>
   <section class="sttbox" id="logcfgbox">
@@ -1483,8 +1487,23 @@ function wireCollapse(toggleId, bodyId, caretId){
       body:JSON.stringify({bargeIn:$('cfgBargeIn').checked})});
       toast('봇 설정 저장됨'); }catch(e){}
   };
+  // 유저 음성 인식 시간(ms): 서버가 0~5000으로 클램프, 봇이 다음 report에서 읽어감.
+  $('cfgBargeInMs').onchange = async ()=>{
+    let ms = Math.round(Number($('cfgBargeInMs').value));
+    if(!Number.isFinite(ms)) ms = 700;
+    ms = Math.max(0, Math.min(5000, ms));
+    $('cfgBargeInMs').value = ms;
+    try{ const r=await fetch('/api/bot/settings',{method:'POST',headers:{'Content-Type':'application/json'},
+      body:JSON.stringify({bargeInMs:ms})});
+      const j=await r.json();
+      if(j&&j.ok&&j.settings&&j.settings.bargeInMs!=null) $('cfgBargeInMs').value=j.settings.bargeInMs;
+      toast('봇 설정 저장됨'); }catch(e){}
+  };
   fetch('/api/bot/settings').then(r=>r.json()).then(j=>{
-    if(j&&j.ok&&j.settings) $('cfgBargeIn').checked = j.settings.bargeIn !== false;
+    if(j&&j.ok&&j.settings){
+      $('cfgBargeIn').checked = j.settings.bargeIn !== false;
+      if(j.settings.bargeInMs!=null) $('cfgBargeInMs').value = j.settings.bargeInMs;
+    }
   }).catch(()=>{});
   // 로그 설정: 잡음 로그 표시 안 함 — 클라이언트 필터(로컬 저장).
   $('cfgHideNoise').checked = hideNoise;