refactor(support): 优化 OpenApiInterceptor 中的代码结构

- 将请求头验证逻辑移至 HandlerMethod 判断之后
-减少了不必要的代码嵌套，提高了代码可读性

policeSecurityServer/src/main/java/com/changhu/support/interceptor/OpenApiInterceptor.java

@@ -23,12 +23,12 @@ public class OpenApiInterceptor implements HandlerInterceptor {
 
     @Override
     public boolean preHandle(@NotNull HttpServletRequest request, @NotNull HttpServletResponse response, @NotNull Object handler) {
+        if (handler instanceof HandlerMethod handlerMethod) {
             String header = request.getHeader("X-API-KEY");
             if (StrUtil.isBlank(header)) {
                 throw new MessageException("请求头缺失");
             }
             log.info("apiKey:{} {} 请求:{}", header, LocalDateTime.now(), request.getRequestURI());
-        if (handler instanceof HandlerMethod handlerMethod) {
             CheckOpenApi methodAnnotation = handlerMethod.getMethodAnnotation(CheckOpenApi.class);
             if (methodAnnotation != null) {
                 List<String> openApiKeys = methodAnnotation.value().getOpenApiKeys();