docs: add station reroute refactor plan

Junjie

2026-03-24 baf1a7a138976f098ddbbf95a9373e0ed4adebe0

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-- 站点路径算法统一固定为 twoStage，清理 legacy 模式配置项
 
DELETE FROM sys_config
WHERE code = 'stationPathScoreMode';