Reuse Binance native depth feed

[jackhai9]

Summary

• passively observe Binance native RPI depth snapshots and stream updates
• remove the duplicate userscript-owned depth connection and resync requests
• preserve native fetch and WebSocket contracts while exposing depth-source diagnostics

Validation

• npm test
• npm run build:binance-orderbook-trade
• npm run check:binance-orderbook-trade
• git diff --check