v2完整版：VoxCPM2语音 + 多轮对话 + 文档重写

- 用VoxCPM2生成128条v2语音（林夏回应+NPC反应+Round3对话）
- story.js全部切换到VoxCPM2音频路径
- engine.js: BGM音量减半(0.2→0.1)、MSG-14前导语支持、结局E用周南新语音
- 林夏.md完整重写：6手势交互、主角有声音、VoxCPM2本地TTS方案
- batch_tts_voxcpm.py: 新增linxia角色、修复self_3y音色、添加全部v2台词
- 新增voice/linxia/参考音色

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

game/js/engine.js

@@ -78,7 +78,7 @@ class GameEngine {
 
     await Snd.startAmbience(AMBIENCE_DEFAULT, { vol: 0.15 });
     await sleep(1500);
-    Snd.startBGM(`${MUS}/lv11_bgm_m1_main_loop_v1.mp3`, { vol: 0.2 });
+    Snd.startBGM(`${MUS}/lv11_bgm_m1_main_loop_v1.mp3`, { vol: 0.1 });
     await sleep(1500);
 
     this._next();
@@ -208,15 +208,25 @@ class GameEngine {
       this.state = 'responding';
       await this._playVoiceAsync([msg.autoReply]);
 
-      // 条件反应（MSG-14：根据 MOM_LINK 播放不同反应）
+      // 条件反应（MSG-14：先播前导语"真的没事？"，再根据 MOM_LINK 播放不同反应）
       if (!this._skipRequested && msg.autoReact) {
-        const val = this.vars[msg.autoReact.condition];
-        const reactUrl = val ? msg.autoReact['true'] : msg.autoReact['false'];
-        if (reactUrl) {
-          this.state = 'reacting';
+        this.state = 'reacting';
+        // 前导语（如"真的没事？"）
+        if (msg.autoReactPreamble) {
           await sleep(500);
           if (!this._skipRequested) {
-            await this._playVoiceAsync([reactUrl]);
+            await this._playVoiceAsync([msg.autoReactPreamble]);
+          }
+        }
+        // 条件分支反应
+        if (!this._skipRequested) {
+          const val = this.vars[msg.autoReact.condition];
+          const reactUrl = val ? msg.autoReact['true'] : msg.autoReact['false'];
+          if (reactUrl) {
+            await sleep(400);
+            if (!this._skipRequested) {
+              await this._playVoiceAsync([reactUrl]);
+            }
           }
         }
       }
@@ -253,7 +263,7 @@ class GameEngine {
     this.msgState[msg.id] = 'read';
     this.vars.UNREAD = Math.max(0, this.vars.UNREAD - 1);
 
-    if (msg.bgm) Snd.startBGM(msg.bgm, { vol: 0.2 });
+    if (msg.bgm) Snd.startBGM(msg.bgm, { vol: 0.1 });
 
     // 系统通知（时光胶囊）
     if (msg.type === 'system_notification') {
@@ -687,9 +697,10 @@ class GameEngine {
   async _endingE() {
     Haptic.message();
     SFX_UI.notify();
+    await sleep(1500);
+    // 周南秒回："那我下次出差来北京，请你吃饭好不好。"
+    await this._playVoiceAsync([`${T}/v2_ending_e_zhounan_wav_v1.mp3`]);
     await sleep(2000);
-    Snd.playVoice([`${TDIR}/lv11_sys_goodnight_wav_v1.mp3`]);
-    await sleep(3000);
     SFX_UI.ending();
     await sleep(1000);
     this._showCaption('好。');