feat: strategy builder

backend/services/strategy_replay.py

@@ -118,6 +118,10 @@ def replay_position(
             "date": d, "spot": chain.get("spot"),
             "position_value": round(value, 2),
             "pnl": round(value - entry_value, 2),
+            # Every day's real per-leg quote/IV/greeks, not just entry/exit — lets the
+            # "Analyse période historique" day-scrubber show the real leg detail for
+            # whichever day is currently scrubbed to, not only the window's endpoints.
+            "legs": day_legs,
         })
 
     if not points: