Add short signal scanner + leverage trading game engine + auto-trader

- short_scanner.py: RSI/VWAP/MACD/Bollinger-based short signal detection
- leverage_game.py: Full game engine with longs/shorts/leverage/liquidations
- leverage_trader.py: Auto-trader connecting scanners to game with TP/SL/trailing stops
- Leverage Challenge game initialized: $10K, 20x max leverage, player 'case'
- systemd timer: every 15min scan + trade
- Telegram alerts on opens/closes/liquidations

projects/crypto-signals/data/leverage-game/games/1ac7d29c/game.json

@@ -0,0 +1,16 @@
+{
+  "game_id": "1ac7d29c",
+  "name": "Leverage Challenge",
+  "starting_cash": 10000.0,
+  "max_leverage": 20,
+  "funding_rate_8h": 0.01,
+  "maker_fee": 0.02,
+  "taker_fee": 0.05,
+  "start_date": "2026-02-09",
+  "creator": "case",
+  "created_at": "2026-02-10T02:31:27.614107+00:00",
+  "players": [
+    "case"
+  ],
+  "status": "active"
+}