feat(web): complete du-an project pages, neighborhood components, and public notification bell

- Add grid/map view toggle on /du-an listing page with Mapbox project markers
- Enhance du-an detail with master plan viewer, neighborhood radar chart, POI map, and price history chart
- Create neighborhood component suite: radar chart (Recharts), POI map (Mapbox), score badges
- Add du-an API client, server-side fetching, and React Query hooks
- Wire NotificationBell into public layout header for authenticated users
- Fix missing PROJECT_STATUS_COLORS import in du-an detail client

Co-Authored-By: Paperclip <noreply@paperclip.ing>

apps/web/components/neighborhood/index.ts

@@ -0,0 +1,10 @@
+export { NeighborhoodRadarChart } from './neighborhood-radar-chart';
+export { NeighborhoodPOIMap } from './neighborhood-poi-map';
+export { NeighborhoodScore } from './neighborhood-score';
+export type {
+  NeighborhoodCategory,
+  NeighborhoodScoreData,
+  POIItem,
+  POICategory,
+} from './types';
+export { POI_CATEGORY_CONFIG, DEFAULT_CATEGORIES } from './types';