```mermaid flowchart LR A[抓取帖子] --> B[统一清洗] B --> C{规则粗筛} C -->|命中| D[LLM 细判] C -->|未命中| H[非成型路线链路] D -->|Itinerary| E[路线标准化] D -->|Non| H E --> F[指标计算 & 分级] F --> G[写 Redis 缓存] H --> I[目的地/POI 抽取+挂靠] I --> G G --> J[Rest/GraphQL API] ```