RSI with Dual Smoothed MAs + Trend Background + Alerts

✅ RSI with selectable source (open, high, low, close, hl2, hlc3, ohlc4)
✅ Two smoothed MAs (SMA, EMA, WMA, RMA, VWMA)
✅ Slope-based MA colors (Green = rising, Red = falling, Gray = flat)
✅ Background shading (Green = bullish, Red = bearish)
✅ Alerts:

Bullish MA crossover

Bearish MA crossover

RSI Overbought (>70)

RSI Oversold (<30)