Add school management REST API and architecture checks

CHANGELOG.md

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+# Changelog
+
+## [1.0] - 2026-10-27
+
+### Added
+
+- Quarkus backend running on Java 25, with health endpoints and Docker support.
+- Domain model for dance schools, dancers, dance groups, coaches, shows and day parts.
+- REST API to create, list, retrieve, update and delete dance schools, dancers, dance groups and shows.
+- Membership management allowing a dancer to belong to multiple groups within a school.
+- Shows with a name, date and three day parts: morning, afternoon and evening.
+- Input validation, school-scoped resource access and cleanup of memberships when dancers are deleted.
+- Shared in-memory storage for the REST API.
+- Separate API model records in `rest.apimodel`.
+- ArchUnit checks for package dependencies, domain independence, package cycles and API model conventions.
+- HTTP integration tests for resource management, memberships, validation and school isolation.
+
+### Fixed
+
+- Adding entities to initially empty dance school and dance group collections now retains them.
+
+### Limitations
+
+- Data is lost when the application stops.
+- Assigning dance groups to show day parts is not yet available.