Canteen Management

IPDs admission Bill Accrual tab (Bed/Procedures/Lab/Total cards) reads Billings bill items bucketed by charge category via an IPD BFF route -- Diet charges (DIET-, now reaching Billing via Redmine #382) had no bucket to land in, so they would fall into generic Other even though the category data already flows end to end. Added a Diet member to Billings ChargeCategory enum (nuvita-billing), mirrored it in the portal enum + charge-master Add/Edit dropdowns + category label maps (charges page, bill-structure.ts), and added a dietCharges bucket + Diet Charges card to IPDs Bill Accrual BFF route and admission page (nuvita-ipd). No new data path -- the BFF already fetches all bill items/charges for the admission. Billing unit suite 2057/2057 green; IPD billing-accrual route tests 8/8 (1 new); IPD portal type-check clean; Billing portal tests for charges page/drawers/bill-structure 47/47 green (billing portal type-check blocked locally by a pre-existing, unrelated GitHub Packages auth gap -- no token available in this environment, same known limitation noted on the original proposal commit).