fix: update binance-fwebsocket-url to /private/ws

[Romazes]

Description

Update USDT futures user-data websocket URL from wss://fstream.binance.com/ws to wss://fstream.binance.com/private/ws.

Related Issue

N/A

Motivation and Context

Binance split the futures websocket endpoints into per-stream-type paths (/public/ws, /market/ws, /private/ws). The legacy /ws path is no longer the canonical entry point for user-data (private) streams on fstream.binance.com, so the config must point at /private/ws to keep the user-data subscription stable.

Requires Documentation Change

No.

How Has This Been Tested?

Connected to wss://fstream.binance.com/private/ws from the launcher with valid USDT futures credentials and confirmed the user-data stream subscribes and receives account/order events as before.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• Refactor (non-breaking change which improves implementation)
• Performance (non-breaking change which improves performance. Please add associated performance test and results)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Non-functional change (xml comments/documentation/etc)

Checklist:

• My code follows the code style of this project.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.
• My branch follows the naming convention bug-<issue#>-<description> or feature-<issue#>-<description>