feat: add race cover image extraction

frontend/src/pages/RaceFormPage.tsx

@@ -31,6 +31,7 @@ interface FormData {
   distanceKm: string;
   status: string;
   officialUrl: string;
+  coverImageUrl: string;
   startTime: string;
   clusterSchedule: string;
   bibPickup: string;
@@ -46,6 +47,7 @@ const EMPTY_FORM: FormData = {
   distanceKm: "",
   status: "planned",
   officialUrl: "",
+  coverImageUrl: "",
   startTime: "",
   clusterSchedule: "",
   bibPickup: "",
@@ -63,6 +65,7 @@ function raceToFormData(race: Race): FormData {
     distanceKm: String(race.distanceKm),
     status: race.status ?? "",
     officialUrl: race.officialUrl ?? "",
+    coverImageUrl: race.coverImageUrl ?? "",
     startTime: race.startTime ?? "",
     clusterSchedule: race.clusterSchedule ?? "",
     bibPickup: race.bibPickup ?? "",
@@ -197,6 +200,7 @@ export function RaceFormPage(): JSX.Element {
             distanceKm: parseFloat(form.distanceKm),
             status: statusValue,
             officialUrl: emptyToNull(form.officialUrl),
+            coverImageUrl: emptyToNull(form.coverImageUrl),
             startTime: emptyToNull(form.startTime),
             clusterSchedule: emptyToNull(form.clusterSchedule),
             bibPickup: emptyToNull(form.bibPickup),
@@ -217,6 +221,7 @@ export function RaceFormPage(): JSX.Element {
             distanceKm: parseFloat(form.distanceKm),
             status: statusValue,
             officialUrl: emptyToNull(form.officialUrl),
+            coverImageUrl: emptyToNull(form.coverImageUrl),
             startTime: emptyToNull(form.startTime),
             clusterSchedule: emptyToNull(form.clusterSchedule),
             bibPickup: emptyToNull(form.bibPickup),
@@ -346,6 +351,18 @@ export function RaceFormPage(): JSX.Element {
             </label>
           )}
 
+          <label className="race-form__field">
+            <span className="race-form__label">URL обложки</span>
+            <input
+              className="race-form__input"
+              type="url"
+              name="coverImageUrl"
+              value={form.coverImageUrl}
+              onChange={handleChange}
+              placeholder="https://…"
+            />
+          </label>
+
           {hideOrgScheduleFields ? null : (
             <div className="race-form__field">
               <span className="race-form__label">Время старта</span>