Add CLAUDE.md

[iliyan-velichkov]

Adds a CLAUDE.md at the repo root to orient Claude Code (and contributors) working in this repository.

What it covers

• What this repo is — a thin Spring Boot launcher that assembles curated Eclipse Dirigible / codbex-platform components into the Gaia Edition; most logic lives in the parent artifacts.
• Build & run — quick-build profile, required --add-opens JVM flags, port 80, default admin/admin, Swagger URL, Docker.
• Tests — unit-tests, integration-tests, tests profiles and how to run a single test.
• Formatting — mvn verify -P format.
• Spring profiles — the common + app-default requirement for Dirigible to activate.
• Module layout — roles of application, branding, components, integration-tests, and that application/pom.xml's dependency list defines the edition.
• Dirigible content convention — the META-INF/dirigible/<guid>/ structure for content projects.
• Product context — Gaia as the shared base platform that customer-facing codbex products extend (see https://www.codbex.com/products/), scoped to Gaia itself.

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