feat(planning-chauffeur): stabilize driver search and use UUID for personalization

Switch planning driver search to backend-only filtering with debounced query and stable local cache Remove fragile local name filter and cache length optimization to avoid disappearing drivers/slots while typing Use driverUuid consistently for planning personalization/duplication flows and reassignment candidates Align planning trajet driver select options and forms with UUID-based driver identity to prevent empty/incorrect chauffeur fields