feat: add role editor page with create/delete functionality

- Add RoleEditorPage with role management
- Add Create New Role button (admin only)
- Add Delete Role button (admin only, admin role protected)
- Fix useAuth import in RoleEditorPage

Dockerfile

@@ -5,7 +5,9 @@ COPY package.json package-lock.json* ./
 RUN npm install
 COPY . .
 ARG VITE_WIZARD_PORT=18080
+ARG VITE_API_BASE
 ENV VITE_WIZARD_PORT=$VITE_WIZARD_PORT
+ENV VITE_API_BASE=$VITE_API_BASE
 RUN npm run build
 
 # Production stage — lightweight static server, no nginx