Show OTM option quotes in option-option mode.

Align session to amplitude Call/Put pair and replace perp/ATM market panels.

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/app/exchange/types.py

@@ -43,12 +43,20 @@ class OptionPair:
     strike: float
     call_inst_id: str
     put_inst_id: str
+    put_strike: float | None = None  # 期期：Put 行权价；None=与 strike 同（ATM）
 
     def to_dict(self) -> dict[str, Any]:
+        put_k = (
+            float(self.put_strike)
+            if self.put_strike is not None
+            else float(self.strike)
+        )
         return {
             "expiry_ymd": self.expiry_ymd,
             "expiry_ms": self.expiry_ms,
             "strike": self.strike,
+            "call_strike": float(self.strike),
+            "put_strike": put_k,
             "call_inst_id": self.call_inst_id,
             "put_inst_id": self.put_inst_id,
         }