Fix general settings route and req.user references

- Update frontend settings service to use correct /api/admin/settings/general route
- Fix all req.user to req.admin references in adminSettings.js
- Ensures settings can be saved without authentication errors

frontend/src/types/index.ts

@@ -16,6 +16,14 @@ export interface Event {
   is_archived: boolean;
   archive_path?: string;
   archived_at?: string;
+  photo_count?: number;
+  total_size?: number;
+  recent_photos?: Array<{
+    filename: string;
+    type: string;
+    size_bytes: number;
+    uploaded_at: string;
+  }>;
 }
 
 export interface GalleryInfo {
@@ -25,6 +33,7 @@ export interface GalleryInfo {
   expires_at: string;
   is_active: boolean;
   is_expired: boolean;
+  requires_password?: boolean;
 }
 
 export interface Photo {