✨ feat(AgenticCommerce): Add checkout endpoint for completin…

[Biont]

WIP

[github-actions]

Test using WordPress Playground

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What's included:

• ✅ WordPress (latest)
• ✅ WooCommerce (latest)
• ✅ PayPal Payments plugin v3.3.0-pr3856-19297308041-g6f599a9 (built from this PR)

Login credentials:

• Username: admin
• Password: password

Plugin Details:

• Version: 3.3.0-pr3856-19297308041-g6f599a9
• Commit: 6f599a9
• Artifact: woocommerce-paypal-payments-3.3.0-pr3856-19297308041-g6f599a9

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