feat: advance legacy UI behavior parity

LegacySceneRuntimeFactory.cs

@@ -510,13 +510,10 @@ internal static class LegacySceneRuntimeFactory
                 "The foreign candle target is invalid.")
         };
         if (parts.Length != 3 ||
-            parts[0].Length is < 1 or > 64 ||
-            parts[0].Any(character => char.IsControl(character) || char.IsSurrogate(character)) ||
+            !LegacyNamedForeignStockRestoreService.IsCanonicalBoundSymbol(parts[0]) ||
             parts[1].Length != 2 ||
             parts[1].Any(character => character is < 'A' or > 'Z') ||
-            !string.Equals(parts[2], expectedType, StringComparison.Ordinal) ||
-            target == CandleMarketTarget.OverseasStock &&
-            parts[1] is not ("US" or "TW"))
+            !string.Equals(parts[2], expectedType, StringComparison.Ordinal))
         {
             throw new LegacySceneDataException(
                 "The foreign candle identity is invalid.");