fix: 修复二元表达式解析器EOF死循环#40
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在ParseExpression中，当一元运算符优先级满足条件但游标已到EOF时， 解析器会反复尝试读取而不前进，导致死循环。增加CursorEOF检查。
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Summary
Parser.Fn.cs中ParseExpression在一元运算符优先级满足条件但游标已到 EOF 时，解析器不前进导致死循环的问题Test plan
dotnet test100 tests passed, 0 failuresExpr_*系列测试验证修复有效