feat: plugin skeleton for Shopware 6.6 and 6.7 with CI and release pipeline

- composer.json (MIT, shopware/core ~6.6.0 || ~6.7.0, PHP ^8.2), plugin class, placeholder icon
- PR checks and release workflow taken over from AeonDumpManager; phpunit runs as a 6.6/6.7 matrix
- CHANGELOG, LICENSE, README, CLAUDE.md, smoke test

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

CHANGELOG.md

@@ -0,0 +1,15 @@
+# Changelog
+
+All notable changes to AeonShopwareTools will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+## [0.0.1] - 2026-11-02
+
+### Added
+
+- Plugin skeleton for Shopware 6.6 and 6.7 (`shopware/core ~6.6.0 || ~6.7.0`, PHP `^8.2`).
+- PR checks (version/changelog, package + validate, phpunit against the latest 6.6 and 6.7) and the release pipeline (Gitea Release + Composer registry), taken over from AeonDumpManager.