fix(optimizer): 修复变量名转义问题

- 在处理变量组时添加了变量名转义逻辑
- 防止特殊字符导致的解析错误

src/Php/Optimizer/SsaTypeOptimizer.php

@@ -48,6 +48,7 @@ trait SsaTypeOptimizer
         }
 
         foreach ($groups as $varName => $varList) {
+            $varName = $this->escapeVarName($varName);
             // Skip parameters — they already have declared types
             if (isset($this->context->arguments[$varName])) {
                 continue;