Replace custom __pulsar_NodeTraversor with native TreeWalker API

[Copilot]

Replaces the custom DOM traversal implementation with JavaScript's built-in document.createTreeWalker() API.

Changes

node_traversor.js: Replaced manual node navigation with TreeWalker methods while preserving identical visitor pattern and traversal order.

// Before: Manual traversal
node = node.childNodes[0];
node = node.nextSibling;
node = node.parentNode;

// After: TreeWalker API
node = walker.firstChild();
node = walker.nextSibling();
node = walker.parentNode();

POM files: Fixed relativePath references in 5 pom.xml files to enable Maven resolution of parent artifact.

Compatibility

No changes required in consuming code (node_ext.js, __pulsar_utils__.js, feature_calculator.js). Visitor callbacks (head/tail) and depth tracking behavior unchanged.

Original prompt

目前，在注入的 javascript 脚本中，使用了自定义的 __pulsar_NodeTraversor，将其替换成 js 内置遍历器

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