Drive semi quote ladder by min remaining hours input.

Picks nearest expiry with hours >= threshold and refreshes the list as the field changes.

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

backend/app/api/market.py

@@ -23,13 +23,14 @@ async def market_option_ladder(
     _user: Annotated[str, Depends(require_user)],
     wings: int = Query(default=5, ge=1, le=12),
     side: str = Query(default="call", pattern="^(call|put)$"),
+    min_hours: float = Query(default=30, ge=1, le=720),
 ) -> dict:
-    """半自动页单边报价列表：ATM 上下各 wings 档；side=call|put。"""
+    """半自动页单边报价：选剩余时长≥min_hours 的最近到期。"""
     gw = get_gateway()
     ladder = getattr(gw, "option_ladder", None)
     if not callable(ladder):
         raise HTTPException(status_code=501, detail="当前会话不支持 option-ladder")
-    return ladder(wings=wings, side=side)
+    return ladder(wings=wings, side=side, min_hours=min_hours)
 
 
 @router.post("/realign")