Fixed fees format on cart and checkout

[girishpanchal30]

Summary

Added the fees to WooCommerce's fees_api to remove the prefix number from the label and generate the unique ID for fees.

Check before Pull Request is ready:

• I have written a test and included it in this PR
• I have run all tests and they pass
• The code passes when running the PHP CodeSniffer
• Code meets WordPress Coding Standards for PHP, HTML, CSS and JS
• Security and Sanitization requirements have been followed
• I have assigned a reviewer or two to review this PR

Closes #230

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[Copilot]

Pull request overview

This PR updates how PPOM adds cart/checkout fees in WooCommerce so fee labels don’t include a leading counter (e.g., 1-...) and fees get explicit unique IDs via WooCommerce’s fees_api.

Changes:

• Removes numeric prefixes from fee labels shown on cart/checkout (fixed fees and matrix/option fees).
• Switches fee creation to $cart->fees_api()->add_fee() and supplies explicit id values for PPOM fees.
• Avoids appending empty parentheses to option-fee labels by only adding ({$option_label}) when present.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
inc/woocommerce.php	Updates legacy-mode one-time fee labels and adds fees via fees_api with explicit IDs.
inc/prices.php	Updates non-legacy cart fee + matrix discount fee labeling and switches fee creation to fees_api with explicit IDs.

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