feat: travel service with 2GIS routing, POI, hotels + finance providers + UI overhaul

- Add travel-svc microservice (Amadeus, TravelPayouts, 2GIS, OpenRouteService)
- Add travel orchestrator with parallel collectors (events, POI, hotels, flights)
- Add 2GIS road routing with transport cost calculation (car/bus/taxi)
- Add TravelMap (2GIS MapGL) and TravelWidgets components
- Add useTravelChat hook for streaming travel agent responses
- Add finance heatmap providers refactor
- Add SearXNG settings, API proxy routes, Docker compose updates
- Update Dockerfiles, config, types, and all UI pages for consistency

Made-with: Cursor

backend/cmd/api-gateway/main.go

@@ -53,6 +53,7 @@ func main() {
 		"discover": cfg.DiscoverSvcURL,
 		"finance":  cfg.FinanceHeatmapURL,
 		"learning": cfg.LearningSvcURL,
+		"travel":   cfg.TravelSvcURL,
 		"admin":    cfg.AdminSvcURL,
 	}
 
@@ -139,6 +140,8 @@ func getTarget(path string) (base, rewrite string) {
 		return svcURLs["finance"], path
 	case strings.HasPrefix(path, "/api/v1/learning"):
 		return svcURLs["learning"], path
+	case strings.HasPrefix(path, "/api/v1/travel"):
+		return svcURLs["travel"], path
 	case strings.HasPrefix(path, "/api/v1/admin"):
 		return svcURLs["admin"], path
 	default: