feat(storage): show unreferenced files in Admin > Storage, with the switch and a check

Desktop and phone show what the last check found (can be freed, unused for
less than a week, freed), why a category was skipped, the switch that lets
the nightly run delete and a report-only check on demand, through the
shared storage panel hook. All 28 languages, and the Admin-Storage wiki
page explains the check, the week's wait and when to leave it off.

client/src/api/client.ts

@@ -56,6 +56,8 @@ import {
   type BookingImportMode,
   type ReceiptScanResult,
   type StorageAdminState,
+  type StorageReclaimReport,
+  type StorageReclaimState,
   type StorageBackend,
   type StorageConfigPut,
   type StorageTestResponse,
@@ -734,6 +736,12 @@ export const adminApi = {
   // A full scan of a large install can exceed the 8s instance timeout.
   refreshStorageStats: (): Promise<StorageUsage> =>
     apiClient.post('/admin/storage/stats/refresh', undefined, { timeout: 120_000 }).then(r => r.data),
+  setStorageReclaimDelete: (deleteEnabled: boolean): Promise<StorageReclaimState> =>
+    apiClient.put('/admin/storage/reclaim', { deleteEnabled }).then(r => r.data),
+  // A check lists every reclaimable category and asks each domain about it; a
+  // large bucket outlasts the 8s instance timeout. It only reports, whatever the switch says.
+  runStorageReclaimCheck: (): Promise<StorageReclaimReport> =>
+    apiClient.post('/admin/storage/reclaim/run', { reportOnly: true }, { timeout: 300_000 }).then(r => r.data),
 }
 
 export const addonsApi = {