feat: add StopsMap and WalkingDirections components for enhanced map functionality

- Implemented StopsMap component to display bus stops on a map using MapLibre GL.
- Integrated walking directions feature in WalkingDirections component to calculate routes from user location to selected bus stop.
- Added geo utility functions for coordinate validation and distance calculation.
- Created route grouping and stop filtering logic in routeGroups module.
- Developed custom hooks for managing stop routes with React Query.
- Added tests for routing and stop functionalities to ensure reliability.

server/features.mjs

@@ -1,4 +1,5 @@
 import { ApiError } from './errors.mjs';
+import { coordinates } from './coordinates.mjs';
 
 const routeNumber = value => typeof value === 'string' ? value.replace(/[\s№]/g, '').toLocaleUpperCase('ru') : '';
 const positive = value => Number.isSafeInteger(Number(value)) && Number(value) > 0;
@@ -32,6 +33,6 @@ export function normalizeNearby(raw) {
     const distance = Number(stop?.distance_meters);
     if (!stop || !positive(stop.id) || typeof stop.name !== 'string' || !stop.name.trim() || stop.distance_meters == null || !Number.isFinite(distance) || distance < 0) throw new ApiError(502);
     return { id: Number(stop.id), name: stop.name.trim(), direction: typeof stop.description === 'string' ? stop.description.trim() : '',
-      routesCount: Number(stop.routes_count) || 0, distance: Math.round(distance) };
+      routesCount: Number(stop.routes_count) || 0, distance: Math.round(distance), ...coordinates(stop.latitude, stop.longitude) };
   }).sort((a, b) => a.distance - b.distance);
 }