FEATURE: [binance] listen token support for margin trading

[kbearXD]

…nToken to replace listenKey

[Copilot]

Pull Request Overview

This PR implements support for Binance's new listenToken subscription method for margin trading user data streams, replacing the deprecated listenKey method. According to Binance's changelog, the old method via wss://stream.binance.com:9443 will be removed in the future.

Key changes:

• Adds new listenToken API integration with automatic token refresh
• Maintains backward compatibility via UseListenKey flag for deprecated method
• Implements WebSocket subscription using userDataStream.subscribe.listenToken

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
pkg/exchange/binance/stream.go	Implements listenToken lifecycle management, adds token refresh worker, and updates WebSocket endpoint selection logic
pkg/exchange/binance/exchange.go	Adds UseListenKey flag and EnableListenKey() method for backward compatibility
pkg/exchange/binance/binanceapi/create_margin_account_listentoken_request.go	Defines API request structure for creating margin account listen tokens
pkg/exchange/binance/binanceapi/create_margin_account_listen_token_request_requestgen.go	Auto-generated request builder code for listen token API
pkg/exchange/binance/listentoken_test.go	Unit tests verifying listenToken/listenKey configuration behavior

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[Copilot]

The log message on line 771 logs every 15 minutes regardless of whether action is needed. Consider moving this log statement inside the condition block (after line 774) or changing it to debug level to reduce noise in production logs.

Suggested change

	log.Info("listenToken is about to expire, refreshing...")
	// Refresh the listenToken
	// Refresh the listenToken
	log.Info("listenToken is about to expire, refreshing...")

[Copilot]

The magic number '3' used to calculate timeout lacks explanation. Consider adding a comment explaining why the timeout is 3x the keep-alive interval, or extract it as a named constant (e.g., listenTokenRefreshTimeoutMultiplier).

[Copilot]

After successfully refreshing the token but failing to subscribe (lines 785-788), the worker continues without resetting the ticker. This could lead to rapid retry attempts if the subscription consistently fails. Consider adding ticker.Reset(time.Minute) after the log statement, similar to the error handling in line 778.

Suggested change

	log.WithError(err).Error("listenToken subscribe error")
	log.WithError(err).Error("listenToken subscribe error")
	ticker.Reset(time.Minute)