Add short selling support

[chand1012]

Summary

• Short selling capability: Bot now scans for both long and short setups every cycle
• Short strategy: Price < 200 SMA (downtrend), 0-5% below 50 SMA (rally to resistance), stop 2% above 50 SMA
• Market regime position sizing: Full size when trading with the trend, 50% when trading against
  • Bull market (SPY > 200 SMA): Longs full size, shorts 50%
  • Bear market (SPY < 200 SMA): Shorts full size, longs 50%
• Side-aware exit strategies: EMA exit and trailing stop now work correctly for both long and short positions

Test plan

• Verify bot starts without errors
• Test in paper trading mode during market hours
• Confirm short setups are detected when stocks meet criteria (price < 200 SMA, near 50 SMA resistance)
• Verify EMA exit triggers correctly for shorts (closes when price > EMA)
• Verify trailing stop activates correctly for profitable shorts

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