fix: 删掉重复定义的旧 checkUpdate

旧版读 \upSrc.value，那个元素早就删了，null.value 抛 TypeError，
点「检查更新」什么都不发生（旧定义覆盖了新定义）。

maipulse/html/index.html

@@ -1334,61 +1334,6 @@ async function updateMaster(){
   ticker('曲库已更新：' + r.new + ' 首' + (r.added > 0 ? '（新增 ' + r.added + '）' : ''), 'ok');
 }
 
-const GH_KEY = 'maipulse.ghrepo';
-const GHT_KEY = 'maipulse.ghtoken';
-
-async function checkGh(){
-  const repo = ($('ghRepo').value || '').trim();
-  const token = ($('ghToken').value || '').trim();
-  if(!repo) return ticker('先填 owner/name', 'err');
-  try{ localStorage.setItem(GH_KEY, repo); if(token) localStorage.setItem(GHT_KEY, token); }catch(e){}
-  const out = $('upOut');
-  out.textContent = '正在问 GitHub…';
-  let q = '/api/update-gh?repo=' + encodeURIComponent(repo);
-  if(token) q += '&token=' + encodeURIComponent(token);
-  const r = await get(q);
-  if(!r.ok){ out.textContent = r.error; return; }
-  if(r.newer){
-    let act = '';
-    if(r.url){
-      if(window.Maipulse && window.Maipulse.installApk){
-        act = '<br><button class="ghost" onclick="Maipulse.installApk(\'' + r.url + '\')">立即下载并安装</button>';
-      }else{
-        act = '<br><a href="' + r.url + '" target="_blank">点这里下载</a>';
-      }
-    }
-    out.innerHTML = '<b style="color:#c0392b">GitHub 上有新版本 ' + r.remote + '</b>（当前 ' + r.current + '）'
-      + (r.notes ? '<br>' + r.notes.slice(0, 300) : '') + act;
-  }else{
-    out.innerHTML = 'GitHub 上已经是最新的（' + r.current + '，远端 ' + r.remote + '）';
-  }
-}
-
-async function checkUpdate(){
-  const src = ($('upSrc').value || '').trim();
-  if(!src) return ticker('先填更新源地址', 'err');
-  try{ localStorage.setItem(UP_SRC_KEY, src); }catch(e){}
-  const out = $('upOut');
-  out.textContent = '正在检查…';
-  const r = await get('/api/update-check?source=' + encodeURIComponent(src));
-  if(!r.ok){ out.textContent = r.error; return; }
-  if(r.newer){
-    let act = '';
-    if(r.url){
-      // Android 壳里直接走系统下载器 + 安装器；网页版给个普通链接
-      if(window.Maipulse && window.Maipulse.installApk){
-        act = '<br><button class="ghost" onclick="Maipulse.installApk(\'' + r.url + '\')">立即下载并安装</button>';
-      }else{
-        act = '<br><a href="' + r.url + '" target="_blank">点这里下载</a>';
-      }
-    }
-    out.innerHTML = '<b style="color:#c0392b">有新版本 ' + r.remote + '</b>（当前 ' + r.current + '）'
-      + (r.notes ? '<br>' + r.notes : '') + act;
-  }else{
-    out.innerHTML = '已经是最新的（' + r.current + '，远端 ' + r.remote + '）';
-  }
-}
-
 /* ---------- 旅行伙伴 ---------- */
 let charPicked = [];
 async function loadCharacters(){
@@ -1970,7 +1915,6 @@ log('就绪。先扫码 → 登录 → 选功能。', 'dim');
   applyLook();
 loadVersion();
 confSummary();
-try{ const _u = localStorage.getItem(UP_SRC_KEY); if(_u && $('upSrc')) $('upSrc').value = _u; const _g = localStorage.getItem(GH_KEY); if(_g && $('ghRepo')) $('ghRepo').value = _g; const _t = localStorage.getItem(GHT_KEY); if(_t && $('ghToken')) $('ghToken').value = _t; }catch(e){}
   loadAccounts();
   // URL 带 ?uid= 时自动查这个账号的 B50 与推分（方便直接看别人的分）
   const uidParam = new URLSearchParams(location.search).get('uid');