feat(kb): VikingDB纯检索+重排+Redis上下文+全库搜索+别名扩展+KB保护窗口+RAG语气引导

- 新增 kbRetriever.js: VikingDB search_knowledge 纯检索替代 Ark chat/completions, doubao-seed-rerank 重排, RAG payload 语气引导缓解音色差异

- 新增 redisClient.js: Redis 连接管理 + 5轮对话历史 + KB缓存双写

- toolExecutor.js: 产品别名扩展25条, 全库检索topK=25, 检索阈值0.01, 精简 buildDeterministicKnowledgeQuery

- nativeVoiceGateway.js: isPureChitchat扩展, KB保护窗口60s, prequery参数调优

- realtimeDialogRouting.js: resolveReply感知KB保护窗口, fast-path适配raw模式

- app.js: 健康检查新增 redis/reranker/kbRetrievalMode

- 新增测试: alias A/B测试, KB retriever测试, Redis客户端测试, raw模式集成测试

test2/server/package.json

@@ -14,8 +14,10 @@
     "crypto-js": "^4.2.0",
     "dotenv": "^16.6.1",
     "express": "^4.18.2",
+    "ioredis": "^5.4.0",
     "mysql2": "^3.19.1",
     "node-fetch": "^2.7.0",
+    "ssh2": "^1.17.0",
     "uuid": "^9.0.0",
     "ws": "^8.19.0"
   }