Photo du bénévole ajoutée par la coordination

Section « Photo » sur la fiche bénévole (ajouter / remplacer / retirer),
PUT/DELETE /editions/{id}/volunteers/{vid}/photo (COORDINATION),
validation de l'image partagée avec le formulaire public (read_photo).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

frontend/src/api/http-client.ts

@@ -155,6 +155,13 @@ export function createHttpApi(baseUrl: string): PlanningApi {
       planning: (editionId, id) =>
         request(`${base(editionId)}/volunteers/${id}/planning`),
       photoBlob: (editionId, id) => requestBlob(`${base(editionId)}/volunteers/${id}/photo`),
+      setPhoto: (editionId, id, file: File) => {
+        const form = new FormData();
+        form.append('file', file);
+        return request(`${base(editionId)}/volunteers/${id}/photo`, { method: 'PUT', body: form });
+      },
+      removePhoto: (editionId, id) =>
+        request(`${base(editionId)}/volunteers/${id}/photo`, { method: 'DELETE' }),
       exportXlsx: async (editionId) => {
         const blob = await requestBlob(`${base(editionId)}/volunteers/export`);
         if (!blob) throw new ApiError(500, 'error.generic', []);