Canteen Management

Caught against a real local failure: EMR (the patient registry) was not running in the dev stack at all, and GET /charges 500d even though every figure on the page comes from this module own DietChargeAccrual rows -- patient name and admission number are display enrichment, not the charge. ListForDateAsync now wraps both external calls (IPatientServiceContract, IAdmissionServiceContract) in their own try/catch, logs a warning, and returns the row with a null name/number instead of failing the whole list. Two new tests, each independently verifying the OTHER lookup still succeeds when one is down.