修复语音/通话聊天记录无法显示在历史面板的问题

根因：chatStore 的 currentBackgroundId 从 localStorage('selectedBackground') 读取，
但前端从未写入该 key，导致语音/通话会话的 bg_id 始终为默认值 1，
与历史面板查询的实际 backgroundId 不匹配。

修复：
- ChatView 新增 cacheSelectedBackground()，在初始化和加载背景时同步到 localStorage
- chatStore voice/call 初始化函数支持 config.background_id 显式覆盖
- ChatView 中 callConfig 补充 background_id 字段
- 后端 _persist_voice_session_history 异常日志升级为 error + traceback

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

backend/api/voice_chat_router.py

@@ -11,6 +11,7 @@ import asyncio
 import base64
 import json
 import logging
+import traceback
 import uuid
 from datetime import datetime
 from typing import Dict, Optional, Any
@@ -824,7 +825,7 @@ async def _persist_voice_session_history(
                 ))
             await db.commit()
     except Exception as e:
-        logger.warning(f"Failed to persist voice session history: user_id={user_id}, mode={mode}, error={e}")
+        logger.error(f"Failed to persist voice session history: user_id={user_id}, mode={mode}, error={e}\n{traceback.format_exc()}")
 
 
 async def _append_voice_log_chunk(

frontend/src/stores/chatStore.js

@@ -679,7 +679,7 @@ export const useChatStore = defineStore('chat', () => {
       ...currentSessionConfig.value,
       ...petConfig,
       ...config,
-      background_id: currentBackgroundId.value
+      background_id: config.background_id || currentBackgroundId.value
     }
 
     voiceSessionReady.value = false
@@ -1110,7 +1110,7 @@ export const useChatStore = defineStore('chat', () => {
       ...currentSessionConfig.value,
       ...petConfig,
       ...config,
-      background_id: currentBackgroundId.value
+      background_id: config.background_id || currentBackgroundId.value
     }
 
     const sent = sendRealtimeMessage(callConfig)

frontend/src/views/ChatView.vue

@@ -1313,6 +1313,7 @@ export default {
         console.log('[ChatView] Final petPosition:', petPosition.value)
 
         cacheSelectedPet(currentPet.value)
+        cacheSelectedBackground(currentBackground.value)
         saveChatConfig()
         syncStoreState()
         await chatStore.fetchUserBalance()
@@ -1329,6 +1330,7 @@ export default {
         const response = await backgroundAPI.detail(backgroundId)
         console.log('[ChatView] loadBackground response:', response.data)
         currentBackground.value = response.data
+        cacheSelectedBackground(currentBackground.value)
         console.log('[ChatView] currentBackground set to:', currentBackground.value)
       } catch (err) {
         console.error('Failed to load background:', err)
@@ -1342,6 +1344,7 @@ export default {
         console.log('[ChatView] loadDefaultBackground response:', response.data)
         if (response.data.data && response.data.data.length > 0) {
           currentBackground.value = response.data.data[0]
+          cacheSelectedBackground(currentBackground.value)
           console.log('[ChatView] currentBackground set to:', currentBackground.value)
         }
       } catch (err) {
@@ -1500,6 +1503,11 @@ export default {
       localStorage.setItem('selectedPet', JSON.stringify(pet))
     }
 
+    const cacheSelectedBackground = (background) => {
+      if (!background || !background.id) return
+      localStorage.setItem('selectedBackground', JSON.stringify(background))
+    }
+
     const refreshActiveVoiceModeWithCurrentPet = async () => {
       // 切换主角后，重建当前语音会话，确保音色/人设使用新主角配置
       if (chatMode.value === 'call' && isInCall.value) {
@@ -1513,7 +1521,8 @@ export default {
           system_role: currentPet.value?.volcano_system_role || currentPet.value?.global_prompt || '你是一个友善的AI助手，用简洁自然的语言和用户交流。',
           character_manifest: currentPet.value?.volcano_character_manifest || '',
           speaking_style: '语气自然亲切，回复简洁',
-          hello_text: `你好！我是${currentPet.value?.volcano_bot_name || currentPet.value?.name || 'AI助手'}，有什么可以帮助你的吗？`
+          hello_text: `你好！我是${currentPet.value?.volcano_bot_name || currentPet.value?.name || 'AI助手'}，有什么可以帮助你的吗？`,
+          background_id: currentBackground.value?.id
         }
 
         const modeWhenReconnect = chatMode.value
@@ -1849,7 +1858,8 @@ export default {
           system_role: currentPet.value?.volcano_system_role || currentPet.value?.global_prompt || '你是一个友善的AI助手，用简洁自然的语言和用户交流。',
           character_manifest: currentPet.value?.volcano_character_manifest || '',
           speaking_style: '语气自然亲切，回复简洁',
-          hello_text: `你好！我是${currentPet.value?.volcano_bot_name || currentPet.value?.name || 'AI助手'}，有什么可以帮助你的吗？`
+          hello_text: `你好！我是${currentPet.value?.volcano_bot_name || currentPet.value?.name || 'AI助手'}，有什么可以帮助你的吗？`,
+          background_id: currentBackground.value?.id
         }
 
         const success = await chatStore.enterRealtimeCallMode(callConfig)