stefan
dbe7c74a9c
Document tenant-aware database schema, multi-tenant strategy, and API references:
- Add database schema documentation: `Database_Schema_V1-V009.md` for tenant-isolated entities (`veranstaltungen`, `turniere`, `bewerbe`, etc.).
- Draft initial Kassa API reference: `Kassa_API.md` (status: DRAFT).
- Finalize Stammdaten API reference: `API_Uebersicht_Stammdaten.md` (status: ACTIVE).
- Summarize tenant isolation and multi-tenant strategy in `Multi_Tenant_Kurz.md`.
- Update `README.md` with links to new references. Mark B-2 roadmap tasks as partially complete.