Advanced Trading Fee Settings (Custom Fees & Discounts)

To make the PnL and bot data analytics reflect real-world outcomes, we need more control over fee calculation during the bot setup:

(1) Manual Fee Input: Allow users to manually input the specific Maker/Taker (Buy/Sell) fee percentages when configuring a new bot.

(2) Fee Discount Option: Many traders register via promotional links (enjoying lifetime fee discounts) or pay fees using exchange tokens (e.g., BNB on Binance, OKB on OKX) for an extra discount. Please add a field where users can input their total fee discount percentage. This will ensure that subsequent data analysis and net profit tracking are pixel-perfect.