Add an Automated "Reinvest Profits" Option

Currently, profits generated by the Grid Bot sit idle. It would be an incredible upgrade if users had the option to reinvest the bot's grid profits back into the active bot. Ideally, this should be highly customizable. Users should be able to configure:

(1) Frequency-based reinvestment: e.g., auto-reinvest every week or every month, and 

(2) threshold-based reinvestment: e.g., auto-reinvest as soon as accumulated grid profits reach a certain value/amount.