Baseline of the P1 conception work produced over sessions 5-7 (was
uncommitted in the working tree). 11-entity model, French naming.
Superseded next by the prod-like revision (English, ~16 entities) per
the 2026-06-04 decision session - this commit preserves the baseline
in history before that rewrite.
Bottom-up derivation from school JSON sources + PROJECT_CONTEXT business rules.
Covers : Categorie, Produit, Menu, MenuProduit, Commande, LigneCommande,
User, Role, Permission, RolePermission. Decisions documented :
prices in INT cents, VAT in per-mille, polymorphic FK with snapshots
on ligne_commande, dynamic roles vs static permissions for RBAC.
