Maintenance mode activates after current draw completes

- When admin enables maintenance, it's set to 'pending' state
- Maintenance activates automatically after the current draw completes
- Admin can use immediate=true to force immediate activation
- Frontend shows 'Maintenance Scheduled' banner when pending
- Telegram bot warns users but still allows purchases when pending
- Both mode and pending status tracked in system_settings table

front_end/src/lib/api.ts

@@ -157,6 +157,16 @@ class ApiClient {
     return this.request(`/jackpot/past-wins?${params.toString()}`);
   }
 
+  async getMaintenanceStatus(): Promise<{ maintenance_mode: boolean; maintenance_pending: boolean; message: string | null }> {
+    try {
+      const response = await this.request<{ data: { maintenance_mode: boolean; maintenance_pending: boolean; message: string | null } }>('/status/maintenance');
+      return response.data;
+    } catch {
+      // If endpoint doesn't exist or fails, assume not in maintenance
+      return { maintenance_mode: false, maintenance_pending: false, message: null };
+    }
+  }
+
   // Auth endpoints
   async nostrAuth(nostrPubkey: string, signedMessage: string, nonce: string) {
     return this.request('/auth/nostr', {