Add CHANGELOG.md

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: dadachi

CHANGELOG.md

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+# Changelog
+
+## [Unreleased]
+
+- Update Rails from 7.1.5.1 to 7.2.3
+- Update Brakeman from 7.0.2 to 7.1.2
+- Add brakeman.ignore for mass assignment false positive
+- Add comprehensive test coverage for models, policies, serializers, and controllers (205 tests)
+- Update app icons with transparent backgrounds
+- Add Active Storage migrations and Rails 7.2 framework defaults
+- Add static error pages (404, 406, 500)
+- Fix RuboCop offenses in Active Storage migrations
+- Add CLAUDE.md for Claude Code guidance
+
+## 2025-06-21
+
+- Update Brakeman gem
+
+## 2025-03-06
+
+- Fix item_tag uniqueness error
+
+## 2025-03-01
+
+- Add item_tags table
+- Remove BundleAssets
+
+## 2025-02-08
+
+- Migrate from Sprockets to Propshaft
+- Update Madmin
+
+## 2025-02-07
+
+- Update Ruby and gems
+- Update Brakeman gem
+- Fix fail updating shopkeeper
+
+## 2024-10-30
+
+- First commit