feat: 修复清除数据、语音缓存、排行榜限制，新增项目配置文件

- 修复 cloud.clearAll 静默失败导致重启后数据恢复
- 清除数据弹窗改用自定义 ui-modal 替代 wx.showModal
- TTS 语音合成增加 fileID 持久化缓存，重启不再重新合成
- 排行榜限制前15名，maxRank 参数化到 config.js
- 新增 config.js 统一管理版本号/更新日期/开发者/排行榜限制
- progress-ring 消除 getSystemInfoSync 弃用警告
- voice.js 增加 InnerAudioContext 错误监听
- storage/util 完善用户资料、打卡日期精度、记录日志

utils/util.js

@@ -33,17 +33,32 @@ const getMonthCalendar = (year, month) => {
   return weeks
 }
 
+/**
+ * Format a Date as `YYYY-MM-DD HH:MM:SS` in local time.
+ *
+ * Used as the canonical `record.date` string so each record has a
+ * precise timestamp (e.g. "2026-06-11 14:30:45"). Use `_dateOnly()`
+ * to strip back to YYYY-MM-DD for date-level comparisons (streak,
+ * leaderboard day filter, etc.).
+ */
 const formatDate = (date) => {
   const y = date.getFullYear()
-  const m = String(date.getMonth() + 1).padStart(2, '0')
+  const mo = String(date.getMonth() + 1).padStart(2, '0')
   const d = String(date.getDate()).padStart(2, '0')
-  return `${y}-${m}-${d}`
+  const h = String(date.getHours()).padStart(2, '0')
+  const mi = String(date.getMinutes()).padStart(2, '0')
+  const s = String(date.getSeconds()).padStart(2, '0')
+  return `${y}-${mo}-${d} ${h}:${mi}:${s}`
 }
 
+/** Strip the time portion of a formatDate string → "YYYY-MM-DD". */
+const _dateOnly = (s) => (typeof s === 'string' && s.length >= 10) ? s.substring(0, 10) : ''
+
 module.exports = {
   formatTime,
   formatDuration,
   getDaysInMonth,
   getMonthCalendar,
-  formatDate
+  formatDate,
+  dateOnly: _dateOnly
 }