feat: Add multi-box plugin support (v2) with test implementation
- Extend plugin-tester to support multi-box plugins with v2 API - Add nyash_plugin_get_box_count/get_box_info/get_type_id functions - Create test multi-box plugin providing TestBoxA and TestBoxB - Update plugin-system.md documentation for v2 format - Add nyash.toml v2 specification for multi-box support - Successfully tested multi-box plugin lifecycle and type resolution This enables one plugin to provide multiple Box types, solving the dependency issue where HTTPServerBox needs SocketBox. 🤖 Generated with [Claude Code](https://claude.ai/code) Co-Authored-By: Claude <noreply@anthropic.com>
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