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/modules/facilities/FacilityForm.jsx

@@ -21,7 +21,9 @@ export const emptyFacilityForm = {
   saturdaySurchargePercent: "",
   sundaySurchargePercent: "",
   holidaySurchargePercent: "",
+  travelCostMode: "Pauschale",
   travelCostRate: "",
+  travelCostPerKm: "",
   minimumHours: "",
   breakPolicy: "",
   billingInterval: "",
@@ -48,7 +50,9 @@ export function facilityToFormValues(facility) {
     saturdaySurchargePercent: facility.saturdaySurchargePercent ?? "",
     sundaySurchargePercent: facility.sundaySurchargePercent ?? "",
     holidaySurchargePercent: facility.holidaySurchargePercent ?? "",
+    travelCostMode: facility.travelCostMode ?? "Pauschale",
     travelCostRate: facility.travelCostRate ?? "",
+    travelCostPerKm: facility.travelCostPerKm ?? "",
     minimumHours: facility.minimumHours ?? "",
     breakPolicy: facility.breakPolicy ?? "",
     billingInterval: facility.billingInterval ?? "",
@@ -80,7 +84,9 @@ export function facilityFormToPayload(form, { includeCrmStatus = false, followUp
     payload.saturdaySurchargePercent = form.saturdaySurchargePercent === "" ? null : Number(form.saturdaySurchargePercent);
     payload.sundaySurchargePercent = form.sundaySurchargePercent === "" ? null : Number(form.sundaySurchargePercent);
     payload.holidaySurchargePercent = form.holidaySurchargePercent === "" ? null : Number(form.holidaySurchargePercent);
+    payload.travelCostMode = form.travelCostMode || "Pauschale";
     payload.travelCostRate = form.travelCostRate === "" ? null : Number(form.travelCostRate);
+    payload.travelCostPerKm = form.travelCostPerKm === "" ? null : Number(form.travelCostPerKm);
     payload.minimumHours = form.minimumHours === "" ? null : Number(form.minimumHours);
     payload.breakPolicy = form.breakPolicy.trim() || null;
     payload.billingInterval = form.billingInterval || null;
@@ -249,8 +255,11 @@ export default function FacilityForm({ form, onChange, includeCrmStatus = false,
 
           <div className="form-row">
             <label className="form-field">
-              <span>Fahrtkosten (EUR, Pauschale je Einsatz)</span>
-              <input type="number" min="0" step="0.01" value={form.travelCostRate} onChange={updateField("travelCostRate")} />
+              <span>Fahrtkosten — Abrechnungsart</span>
+              <select value={form.travelCostMode} onChange={updateField("travelCostMode")}>
+                <option value="Pauschale">Pauschale je Einsatz</option>
+                <option value="ProKilometer">Pro Kilometer</option>
+              </select>
             </label>
 
             <label className="form-field">
@@ -259,6 +268,20 @@ export default function FacilityForm({ form, onChange, includeCrmStatus = false,
             </label>
           </div>
 
+          <div className="form-row">
+            {form.travelCostMode === "ProKilometer" ? (
+              <label className="form-field">
+                <span>Fahrtkosten (EUR/km)</span>
+                <input type="number" min="0" step="0.01" value={form.travelCostPerKm} onChange={updateField("travelCostPerKm")} />
+              </label>
+            ) : (
+              <label className="form-field">
+                <span>Fahrtkosten (EUR, Pauschale je Einsatz)</span>
+                <input type="number" min="0" step="0.01" value={form.travelCostRate} onChange={updateField("travelCostRate")} />
+              </label>
+            )}
+          </div>
+
           <label className="form-field">
             <span>Pausenregelung</span>
             <input value={form.breakPolicy} onChange={updateField("breakPolicy")} />