Integrate NinjaTrader Platform for Futures Trading Support

Implement NinjaTrader Platform Integration to Enable Futures Trading Connectivity.

Users need the ability to connect their NinjaTrader platform accounts to PF1 to support futures trading analysis and management. This feature would add NinjaTrader as a supported platform option within PF1's account connection interface, enabling futures traders to link their NinjaTrader accounts for comprehensive portfolio tracking, performance analysis, and trade journaling alongside their forex and other prop firm accounts. The integration should support all standard PF1 functionality including trade importing, real-time data synchronization, performance metrics, dashboard reporting, and futures-specific analytics such as contract specifications, margin requirements, and rollover tracking to ensure NinjaTrader users trading futures can fully utilize the platform's trading analytics and management capabilities.

Original request in Discord by WeAreCharlieKirk:

https://discord.com/channels/1398423459662663820/1398819313108123759/1426649160962281654