feat(hass): 新增小爱音箱接入 Home Assistant Assist 的完整示例

- 新增完整的 Home Assistant 集成示例，支持文本对话与上下文会话
- 实现小爱音箱事件解析与 TTS 播报，支持实时打断功能
- 添加连续会话管理，支持区域上下文注入和会话超时结束
- 提供完整的配置系统、类型定义和错误处理
- 包含 Rust 扩展模块用于小爱音箱通信，支持音频流处理
- 添加单元测试、集成测试脚本和 Docker 部署支持
- 提供详细的使用文档和配置说明

examples/hass/config.example.json

@@ -0,0 +1,36 @@
+{
+  "homeassistant": {
+    "url": "http://homeassistant.local:8123",
+    "access_token": "YOUR_LONG_LIVED_ACCESS_TOKEN",
+    "assistant_entity_id": "home_assistant",
+    "language": "zh-cn",
+    "conversation_id": null,
+    "timeout_seconds": 2.5
+  },
+  "xiaoai": {
+    "tts_blocking": false,
+    "shell_timeout_ms": 600000,
+    "interrupt_on_new_input": true,
+    "interrupt_command": "ubus call mibrain ai_service '{\"nlp\":1,\"nlp_text\":\"\"}'",
+    "continuous_conversation_enabled": true,
+    "session_idle_timeout_seconds": 15,
+    "session_end_keywords": ["再见", "拜拜", "滚", "退下"],
+    "client_ip_area_mapping": {
+      "192.168.1.101": "客厅",
+      "192.168.1.102": "主卧"
+    }
+  },
+  "runtime": {
+    "concurrency": 4,
+    "log_level": "INFO",
+    "persist_state_path": "state.json"
+  },
+  "voice": {
+    "enabled": false,
+    "mode": "record_vad_pipeline",
+    "vad_aggressiveness": 2,
+    "min_silence_ms": 800,
+    "max_utterance_ms": 15000,
+    "sample_rate": 16000
+  }
+}