feat: multi-strategy paper trader — N strategie in parallelo su testnet

- src/live/multi_runner.py: orchestratore con fetch raggruppato per asset/tf
- src/live/strategy_worker.py: worker indipendente con stato persistente JSONL
- src/live/strategy_loader.py: import dinamico classi Strategy
- strategies.yml: config dichiarativa con defaults e override per strategia
- Docker: container unico, strategies.yml montato come volume read-only
- Supporta hot-add: aggiungi riga YAML + restart, storico intatto
- Ogni strategia: €1000 USDC virtuale, equity tracking, Telegram notify

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

strategies.yml

@@ -0,0 +1,33 @@
+defaults:
+  capital: 1000
+  position_size: 0.15
+  leverage: 3
+  hold_bars: 3
+  poll_seconds: 60
+  retrain_hours: 24
+
+strategies:
+  - name: SQ02_antifake_vol
+    asset: BTC
+    tf: 15m
+    enabled: true
+
+  - name: SQ02_antifake_vol
+    asset: ETH
+    tf: 15m
+    enabled: true
+
+  - name: SQ01_squeeze_base
+    asset: BTC
+    tf: 15m
+    enabled: true
+
+  - name: ML01_squeeze_gbm
+    asset: ETH
+    tf: 15m
+    enabled: true
+    position_size: 0.15
+    params:
+      ml_threshold: 0.70
+      bb_window: 14
+      sq_threshold: 0.8