Add Verpflegungsmehraufwand (VMA) as fixed facility condition field

Adds MealAllowanceRate as a flat, nullable EUR amount on Facility, following
the same pattern as the existing TravelCostRate/BillingRate fields — a fixed
per-facility rate, not the statutory day-based VMA tiers, per explicit
request.

Both generated API clients are regenerated/rebuilt as required after any
Contract/Controller change (see omsorgCore/CLAUDE.md, "Generierte API-
Clients"). The PHP client regen also picks up the DELETE /api/roles/{id}
endpoint added in a previous backend change but never synced to this client
until now.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

omsorgWeb/mitarbeiter-app/api-client-php/docs/Model/FacilityResponse.md

@@ -26,8 +26,8 @@ Name | Type | Description | Notes
 **travel_cost_rate** | **float** |  | [optional]
 **travel_cost_mode** | **string** |  | [optional]
 **travel_cost_per_km** | **float** |  | [optional]
+**meal_allowance_rate** | **float** |  | [optional]
 **minimum_hours** | **float** |  | [optional]
-**break_policy** | **string** |  | [optional]
 **billing_interval** | **string** |  | [optional]
 **payment_term_days** | **int** |  | [optional]
 **individual_agreements** | **string** |  | [optional]