feat(dotnet): migrate core formulas, deploy tools, and blazor admin web app to .NET 10

src/dotnet/QuantEngine.Core/Domain/SellPriceSanityChecker.cs

@@ -0,0 +1,63 @@
+using System;
+using System.Collections.Generic;
+
+namespace QuantEngine.Core.Domain
+{
+    public class SellPriceSanityResult
+    {
+        public string SellPriceSanityStatus { get; set; } = "PASS";
+        public List<string> SellPriceSanityIssues { get; set; } = new List<string>();
+        public bool HtsAllowed { get; set; } = true;
+        public bool ShadowLedger { get; set; }
+        public string Ticker { get; set; } = string.Empty;
+    }
+
+    public static class SellPriceSanityChecker
+    {
+        public static SellPriceSanityResult CheckSellPriceSanity(
+            double sellLimitPrice,
+            double? stopLossPrice,
+            double prevClose,
+            string ticker = "")
+        {
+            var issues = new List<string>();
+            string status = "PASS";
+
+            if (stopLossPrice.HasValue && sellLimitPrice < stopLossPrice.Value)
+            {
+                issues.Add($"INVALID_PRICE_INVERSION: sell={sellLimitPrice:N0} < stop={stopLossPrice.Value:N0}");
+                status = "INVALID_PRICE_INVERSION";
+            }
+
+            double upperLimit = prevClose * 1.30;
+            if (sellLimitPrice > upperLimit)
+            {
+                issues.Add($"INVALID_UNREALISTIC_PRICE: sell={sellLimitPrice:N0} > prev_close*1.30={upperLimit:N0}");
+                if (status == "PASS")
+                {
+                    status = "INVALID_UNREALISTIC_PRICE";
+                }
+            }
+
+            int tickUnit = KrxTickNormalizer.GetTickUnit(sellLimitPrice);
+            if (sellLimitPrice % tickUnit != 0)
+            {
+                double corrected = KrxTickNormalizer.NormalizeTick(sellLimitPrice);
+                issues.Add($"INVALID_TICK: sell={sellLimitPrice:N0} 호가단위={tickUnit}원 → 정규화={corrected:N0}");
+                if (status == "PASS")
+                {
+                    status = "INVALID_TICK";
+                }
+            }
+
+            return new SellPriceSanityResult
+            {
+                SellPriceSanityStatus = status,
+                SellPriceSanityIssues = issues,
+                HtsAllowed = status == "PASS",
+                ShadowLedger = status != "PASS",
+                Ticker = ticker
+            };
+        }
+    }
+}