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>

pages/settings/settings.js

@@ -53,6 +53,11 @@ Page({
     currentPlanId: 'beginner',
     voiceGuide: true,
     vibrate: true,
+    voiceGender: 'female',
+    voiceGenderOptions: [
+      { key: 'female', name: '女声' },
+      { key: 'male', name: '男声' }
+    ],
     icons: iconsMod.build(),
     nickName: '',
     avatarUrl: '',
@@ -86,6 +91,7 @@ Page({
       currentPlanId: s.planId,
       voiceGuide: s.voiceGuide,
       vibrate: s.vibrate,
+      voiceGender: s.voiceGender || 'female',
       currentThemeId: theme.id,
       theme,
       icons: iconsMod.build(theme),
@@ -238,6 +244,15 @@ Page({
     this.setData({ vibrate: e.detail.value })
   },
 
+  onSelectVoiceGender(e) {
+    const key = e.currentTarget.dataset.key
+    if (key === this.data.voiceGender) return
+    const s = storage.getSettings()
+    s.voiceGender = key
+    storage.saveSettings(s)
+    this.setData({ voiceGender: key })
+  },
+
   onCopyWechat() {
     wx.setClipboardData({
       data: config.developer,

pages/settings/settings.wxml

@@ -118,6 +118,21 @@
       </view>
       <switch checked="{{voiceGuide}}" bindchange="onToggleVoice" color="{{theme.primary}}"/>
     </view>
+    <view class="setting-row">
+      <view class="setting-left">
+        <image class="setting-icon" src="{{icons.voiceFill}}" mode="aspectFit"></image>
+        <text class="setting-label">语音音色</text>
+      </view>
+      <view class="segmented">
+        <view
+          class="segmented-item {{voiceGender === item.key ? 'active' : ''}}"
+          wx:for="{{voiceGenderOptions}}"
+          wx:key="key"
+          data-key="{{item.key}}"
+          bindtap="onSelectVoiceGender"
+        >{{item.name}}</view>
+      </view>
+    </view>
     <view class="setting-row">
       <view class="setting-left">
         <image class="setting-icon" src="{{icons.notificationFill}}" mode="aspectFit"></image>

pages/settings/settings.wxss

@@ -178,6 +178,27 @@
 
 .setting-row:last-child { border-bottom: none; }
 
+/* ---- segmented control (语音音色等二选一) ---- */
+.segmented {
+  display: flex;
+  background: var(--bg-soft);
+  border-radius: 12rpx;
+  padding: 4rpx;
+}
+.segmented-item {
+  padding: 10rpx 28rpx;
+  font-size: 24rpx;
+  color: var(--text-secondary);
+  border-radius: 8rpx;
+  transition: background 0.2s ease, color 0.2s ease;
+}
+.segmented-item.active {
+  background: var(--card-bg);
+  color: var(--primary);
+  font-weight: 600;
+  box-shadow: 0 2rpx 6rpx rgba(0, 0, 0, 0.08);
+}
+
 .setting-left {
   display: flex;
   align-items: center;