✨ feat(display): 完成小智式牛牛屏幕适配 - #226
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为本地唤醒、播报结束和待机恢复增加脱敏生命周期事件，验收采集器现在会拒绝乱序事件和失败事件。\n\n主机测试与 ESP32-S3 Profile 构建用于验证证据字段不影响运行链路。
移除汇报文档、过程文档入口和与 Linx 语音链路无关的探针变更，仅保留功能代码、必要测试与实际 Profile 依赖。
提高有界事件队列容量并提升事件 worker 优先级，避免真人语音突发帧使 Linx Transport 溢出并误报 Provider 失败。
- codec 新增 goodbye 与 llm 消息类型，服务端会话告别与表情消息不再触发 provider_error - WebSocket 分块重组支持 ESP-IDF 对超长单帧的分块投递，TTS 音频帧可完整拼接播放 - runtime 增加脱敏诊断日志 PROVIDER_ERROR_DETAIL，便于板端定位错误来源 - 补充 linx codec/provider 与分块重组契约测试
- OLED 显示牛头表情（neutral/happy/sad/thinking/surprised/speaking/angry）与 23 个中文字形 - 空闲/聆听/思考/播报/停止/重连/错误状态全部中文化 - 唤醒反馈“收到！”、结束反馈“牛牛走了！” - 唤醒后 12 秒无有效输入自动结束聆听回待机，避免服务端闲聊回复 - 修复 voice_audio_sink 任务栈溢出（3072→16384），消除空闲时崩溃重启
- 脸型从圆角矩形改为上宽下窄的倒梯形 - 牛角改为向两侧上弯的三角形态，更贴近真实牛头 - 7 个表情（neutral/happy/sad/thinking/surprised/speaking/angry）同步重绘
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结论
本 PR 提交小智式板端交互与牛牛状态屏代码，补齐唤醒、聆听、思考、说话、错误和待机状态的显示闭环。请 Reviewer 重点检查显示适配器与运行时状态边界，以及牛头点阵的可读性。当前作为 Draft 提交，后续继续完善设计文档和实板显示细节。
Refs #222
变更
明确未包含：
架构与兼容
显示逻辑通过
voicelife_display_esp适配器接入运行时，核心语音、MCP 和服务端协议边界不变；不改变feat/board-xiaozhi-ux分支。验证
./scripts/run_pre_submit_checks.shesp32s3-dev、esp32s3-lichuang-audio-probe、esp32s3-voicelife-pcb-pcmProfile 检查通过证据：本地提交前门禁完整输出；PostgreSQL 契约测试因本机未启动 PostgreSQL 按门禁规则跳过。
TDD 记录
风险与回退
feat/board-xiaozhi-ux分支。Review 清单