GitHub
e58de789ab
feat(ws): /ws/realtime 接通 RealtimeDataFeed — 按需轮询 hub + fan-out + 冒烟脚本
- web/realtime_hub.py：RealtimeStreamHub——订阅集合变化按需启停 RealtimeDataFeed，
无人订阅完全停止轮询（对齐 QuoteStreamer 节能）；EventBus → 每连接队列
fan-out（丢最旧保最新）；去重标的上限 80；lifespan 挂载/关闭
- routers/realtime.py 重写：连接即订阅、断开退订、subscribe/unsubscribe 控制帧、
30s ping 心跳；单一写者泵模型（全部出站帧经队列串行，防并发 send 交错）
- 修复 RealtimeDataFeed stop-before-start 竞态（_stop_requested 标志），
补 2 个回归用例；hub 单测 10 例（并发订阅/退订竞态、跨标的串扰、背压、
TestClient 端到端）
- 前端接入选文档方案（api_reference.md 协议+重连/心跳骨架；README 撤「未联动」）：
SSE 已覆盖看板/自选实时刷新，WS 定位按需单标的 tick，双通道冗余无必要
- scripts/ws_smoke.py：手动冒烟（mock 模式实测 tick 帧与动态订阅确认可见）
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