Apply grab-deps asset registration pattern

[fumikito]

Summary

• Add @handle/@deps/@footer headers to JS source files for grab-deps
• Implement wp-dependencies.json-based asset registration via cookie_tasting_register_assets()
• Simplify wp_enqueue_script/style calls to handle-only (remove manual wp_register_script with hardcoded paths/deps/versions)
• Remove load_plugin_textdomain call (translations handled by GlotPress)
• Remove committed wp-dependencies.json (now a build artifact, added to .gitignore)
• Commit package-lock.json (removed from .gitignore)
• Update deploy.yml to use npm run package instead of bash bin/build.sh

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