feat(api,ws,openapi,cmd,storage): add HL price SSE & cancel-by-metadata #8
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…ta; wire emitter/price source; improve unseal wait
* **API**: add `POST /api/orders/{metadata}/cancel` (dry-run + reason, 404/409 handling)
* **SSE**: add `GET /sse/hyperliquid/prices` streaming BBO frames (`event: bbo`)
* **WS**: implement BBO pub-sub (topic, broadcast, per-coin normalization, initial snapshot)
* **DI**: `WithOrderEmitter`, `WithHyperliquidPriceSource` (+ proxy) and wiring in `main`
* **Startup**: wait for vault unseal concurrently; handle early HTTP server failure/cancel
* **OpenAPI/Gen**: update `openapi.yaml`, regenerate ops
* **Storage**: use `UnixMilli` for *_utc filters (better precision)
* **Logging**: richer errors/warnings in WS and SSE paths
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feat(api,ws,openapi,cmd,storage): add HL price SSE & cancel-by-metadata; wire emitter/price source; improve unseal wait
POST /api/orders/{metadata}/cancel(dry-run + reason, 404/409 handling)GET /sse/hyperliquid/pricesstreaming BBO frames (event: bbo)WithOrderEmitter,WithHyperliquidPriceSource(+ proxy) and wiring inmainopenapi.yaml, regenerate opsUnixMillifor *_utc filters (better precision)