Frontend changes:
- Pass mode, tradingAmount, balancePercentage, dexProvider to optimized API
- Send user's actual trading mode choice (LIVE/SIMULATION)
Backend changes:
- Accept mode and trading parameters from frontend request
- Use passed mode instead of hardcoded 'SIMULATION'
- Apply user's trading amount and balance percentage settings
This fixes the issue where optimized automation always used SIMULATION
regardless of user's LIVE trading selection.
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