Add changelog

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project 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).
+
+## [0.7.0] - 2026-08-17
+
+### Removed
+
+- **SaaS mode and subscription billing** (#37) — dropped Laravel Cashier, the `Billable` trait, `SubscriptionController`, the `RequireSubscription`/`RequireSaasMode` middleware, the `/subscription` and `/billing` routes, the billing/subscription views, the Cashier migrations, and the `stripe` service config.
+- **Demo mode** (#38) — removed the demo middleware, demo-account seeding and purge commands, and demo-only UI.
+- **`APP_MODE` plumbing** (#39) — removed `AppModeEnum`, the `app/helpers.php` global helper, and the `mode`/`demo_subscribe_url` config keys; the app now runs in a single self-hosted mode.
+- **Dead code** (#40) — deleted `frontend-old/`, `bin/start-dev`, the unused `welcome.blade.php`, and the stale root-level `build_and_push.sh`/`update.sh` scripts.
+
+### Changed
+
+- **License** (#41) — adopted AGPL-3.0 as the single project license (`LICENSE.md`, `composer.json`, `README.md`).
+- **Registry and remote references** — repointed build, push, and update scripts and docs at `forge.lvl0.xyz/lvl0/dishplanner`, removing the stale LAN-registry and old `backend` naming.
+- **Documentation** — updated the production and development instructions.
+
+### Fixed
+
+- Fixed health-check warnings in the development shell.
+- Fixed schedule regeneration iterating every user instead of the planner's own users.