Add ARCHITECTURE.md to define domain and model architecture
- Introduce a comprehensive architecture document outlining the app's domain model, design principles, and shared conventions. - Establish the foundation for multi-tenancy and tenant scoping via `Club` as the tenant root and `ClubScopedModel`. - Detail the decomposition of the app into planned sub-apps and their responsibilities. - Define model structure, relationships, and access control mechanisms (RBAC) through `ClubRole` and service-layer authorization. - Provide a roadmap for tenant-aware features: seasons, rosters, events, shop, and dynamic forms.
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