Release version 1.2.0 - Add complete variable product support

This major feature release adds full support for WooCommerce variable products with variation-level pricing configuration.

## Key Features
- Each product variation can have independent tier and package pricing
- AJAX-based dynamic pricing table loading on variation selection
- Admin UI integrated into WooCommerce variation panels
- Full backward compatibility with existing simple product functionality
- WooCommerce Blocks compatibility maintained

## Implementation Highlights
- Effective ID pattern throughout codebase for variation handling
- Variation-specific meta boxes with field prefix support
- Template system updated to support both simple and variation products
- JavaScript enhancements for variation selector integration
- Cart logic updated to handle variation pricing correctly

## Files Changed
- Core: wc-tier-and-package-prices.php (version 1.2.0), composer.json
- Cart: includes/class-wc-tpp-cart.php (effective ID logic)
- Frontend: includes/class-wc-tpp-frontend.php (AJAX endpoint, variation detection)
- Admin: includes/class-wc-tpp-product-meta.php (variation hooks and methods)
- Templates: templates/admin/*.twig (field prefix support, table structure)
- JavaScript: assets/js/*.js (variation support)
- Documentation: CHANGELOG.md, README.md, CLAUDE.md

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

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