feat(voice): 语音参数移入 config.js + 设置页男女声切换

- config: 新增 tts.female/male 两组参数(voiceType/volume/speed),
  直接改数字即可调音色,无需改逻辑代码
- storage: getSettings 兜底 voiceGender(旧用户迁移为女声)
- voice: 新增 _getTtsParams 读 config+性别;缓存 key 含完整参数,
  改音色/音量/性别自动重新合成,无需手动清缓存
- settings: 训练偏好加"语音音色"segmented(女声/男声)
- tts 云函数: _synthesize 用传入 opts 合成;_upload 路径含 voiceType
  (男/女不同文件);需重新部署

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

utils/voice.js

@@ -17,6 +17,8 @@
  * the user with toast errors mid-plank.
  */
 
+const config = require('../config')
+
 const PROMPTS = {
   start: '训练已开始',
   halfway: '已完成一半啦,坚持就是胜利!',
@@ -58,34 +60,56 @@ const _getCtx = () => {
   return _ctx
 }
 
+/**
+ * Resolve the TTS params (voiceType/volume/speed) for the user's chosen
+ * voice gender from config.js. Cached fileIDs are keyed on these params,
+ * so changing them (or switching gender) auto-invalidates stale audio.
+ */
+const _getTtsParams = () => {
+  const s = wx.getStorageSync('user_settings') || {}
+  const gender = s.voiceGender === 'male' ? 'male' : 'female'
+  const params = (config.tts && config.tts[gender]) || config.tts.female
+  return {
+    voiceType: params.voiceType,
+    volume: params.volume,
+    speed: params.speed
+  }
+}
+
 const _fetchUrl = async (promptKey) => {
+  const { voiceType, volume, speed } = _getTtsParams()
+  // Key the cache on the full param set so changing voiceType/volume/speed
+  // (or switching gender) automatically re-synthesizes instead of serving
+  // stale audio. No manual cache clearing needed.
+  const cacheKey = `${promptKey}:${voiceType}:${volume}:${speed}`
+
   // 1. In-memory cache: same-session instant return
-  if (_urlCache[promptKey]) return _urlCache[promptKey]
+  if (_urlCache[cacheKey]) return _urlCache[cacheKey]
 
   // 2. Persistent fileID cache: pass to cloud function for instant getTempFileURL
   _loadFileIDCache()
-  const cachedFileID = _fileIDCache[promptKey] || null
+  const cachedFileID = _fileIDCache[cacheKey] || null
 
   try {
     const res = await wx.cloud.callFunction({
       name: 'tts',
-      data: { promptKey, fileID: cachedFileID },
+      data: { promptKey, fileID: cachedFileID, voiceType, volume, speed },
       // Timeout: 30s for first synthesis (cold start), <1s for cached
       config: { timeout: 30000 }
     })
     if (res && res.result && res.result.success && res.result.audioUrl) {
-      _urlCache[promptKey] = res.result.audioUrl
+      _urlCache[cacheKey] = res.result.audioUrl
 
       // Persist the fileID if we got a new one (first synthesis or
       // re-synthesis after cache invalidation).
       if (res.result.fileID && res.result.fileID !== cachedFileID) {
-        _fileIDCache[promptKey] = res.result.fileID
+        _fileIDCache[cacheKey] = res.result.fileID
         _saveFileIDCache()
       }
       return res.result.audioUrl
     }
   } catch (e) {
-    // cloud function not deployed or other error — silent fallback
+    // cloud function not deployed or other error - silent fallback
   }
   return null
 }