Add phase roadmap and Phase 1 implementation plan
Phase roadmap: 9 phases from foundation to frontend, each producing
working, testable software independently.
Phase 1 plan: Foundation + Auth — 10 tasks, ~60 steps covering:
- Maven project setup (Spring Boot 3.4.3, Java 21)
- PostgreSQL + Docker Compose + TestContainers
- Flyway migrations (users, roles, permissions, audit_log)
- Immutable audit logging framework
- User registration with bcrypt
- Ed25519 JWT signing (no third-party JWT library)
- Login with audit trail
- Spring Security JWT filter + RBAC
- Dockerfile + Gitea Actions CI
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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