Add paginated users/roles, user status, frontend permissions, profile pictures, identifier file storage

- Users page: paginated, searchable, sortable with inline roles (no N+1)
- Roles page: paginated, searchable, sortable + /roles/all for dropdowns
- User is_active field with migration, PATCH toggle, auth check (disabled=401)
- Frontend permission checks: auth store loads permissions, sidebar/buttons conditional
- Profile pictures via file storage for users and members, avatar component
- Identifier images use file storage API instead of base64
- Fix TypeScript errors across admin UI
- 64 API tests passing (10 new)

packages/backend/src/routes/v1/files.ts

@@ -42,7 +42,7 @@ export const fileRoutes: FastifyPluginAsync = async (app) => {
     }
 
     // Validate entityType is a known type
-    const allowedEntityTypes = ['member', 'member_identifier', 'product', 'rental_agreement', 'repair_ticket']
+    const allowedEntityTypes = ['user', 'member', 'member_identifier', 'product', 'rental_agreement', 'repair_ticket']
     if (!allowedEntityTypes.includes(entityType)) {
       throw new ValidationError(`Invalid entityType: ${entityType}`)
     }