Add kilometer-based Fahrtkosten billing, self-service distance entry, role deletion

- Facility: TravelCostMode (Pauschale/ProKilometer) + TravelCostPerKm, alongside
  the existing flat rate; fixes FacilityService.UpdateAsync silently dropping all
  Konditionen fields on update.
- New EmployeeFacilityDistance (Mitarbeiter x Einrichtung -> km) with full
  office-side CRUD in omsorgapp, plus a self-service endpoint/UI so field staff
  can maintain their own commute distance via OMSORG Connect (new
  ModuleType.EmployeeFacilityDistances, Own-scope, no Facilities access needed).
- Roles can now be deleted (blocked with a 409 while still assigned to a user).
- Fix employeesApi.js missing the Date-object conversion for dateOfBirth/entryDate/
  exitDate that crashed employee creation whenever a date was filled in; add a
  clear/remove control for those date fields.
- Requirements: flesh out FR-REC-3 with a staged Akquise cadence, add FR-REC-5/6
  for CRM feature scope and success metrics.
- Regenerate api-client-ts and api-client-php for all of the above.

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

omsorgapp/src/api/employeeFacilityDistancesApi.js

@@ -0,0 +1,26 @@
+import { EmployeeFacilityDistancesApi } from "omsorgcore-client-ts";
+import { configFor, callApi } from "./apiClientHelpers.js";
+
+// Kapselt /api/facilities/{facilityId}/employee-distances von omsorgCore
+// (EmployeeFacilityDistancesController) über den generierten Client (omsorgcore-client-ts).
+// Mitarbeiter-Einrichtung-Entfernungen sind eine 1:n-Unterressource von Facility (FR-EIN-4,
+// Grundlage für die kilometerbasierte Fahrtkostenabrechnung).
+export async function listEmployeeFacilityDistances(accessToken, facilityId) {
+  const api = new EmployeeFacilityDistancesApi(configFor(accessToken));
+  return callApi(api.apiFacilitiesFacilityIdEmployeeDistancesGetRaw({ facilityId }));
+}
+
+export async function createEmployeeFacilityDistance(accessToken, facilityId, payload) {
+  const api = new EmployeeFacilityDistancesApi(configFor(accessToken));
+  return callApi(api.apiFacilitiesFacilityIdEmployeeDistancesPostRaw({ facilityId, createEmployeeFacilityDistanceRequest: payload }));
+}
+
+export async function updateEmployeeFacilityDistance(accessToken, facilityId, id, payload) {
+  const api = new EmployeeFacilityDistancesApi(configFor(accessToken));
+  return callApi(api.apiFacilitiesFacilityIdEmployeeDistancesIdPutRaw({ facilityId, id, updateEmployeeFacilityDistanceRequest: payload }));
+}
+
+export async function deleteEmployeeFacilityDistance(accessToken, facilityId, id) {
+  const api = new EmployeeFacilityDistancesApi(configFor(accessToken));
+  return callApi(api.apiFacilitiesFacilityIdEmployeeDistancesIdDeleteRaw({ facilityId, id }));
+}