chore: 上线前优化 — 清理调试日志/启用组件按需注入/补全组件声明

- 移除全项目 34 处调试 console.* 输出
- project.config.json: minified true、uploadWithSourceMap false、启用 lazyCodeLoading(requiredComponents 组件按需注入)
- pages/records/records.json 补全 ui-skeleton 组件声明(此前漏声明,WXML 已使用)
- 删除根目录残留 preview-buttons.html

utils/storage.js

@@ -68,7 +68,6 @@ const saveRecord = (record) => {
   // a 1-minute tolerance for normal clock skew.
   const recordTime = new Date(record.date.replace(/-/g, '/')).getTime()
   if (recordTime > Date.now() + 60 * 1000) {
-    console.warn('[storage] saveRecord rejected: future date', record.date)
     wx.showToast({ title: '系统时间异常,请检查', icon: 'none' })
     return
   }
@@ -79,7 +78,6 @@ const saveRecord = (record) => {
   records[month].push(record)
   records[month].sort((a, b) => b.date.localeCompare(a.date))
   wx.setStorageSync(RECORDS_KEY, records)
-  console.log('[storage] saveRecord date=' + record.date + ' duration=' + record.duration)
   cloud.pushAll()
 }