feat: add data sources config system and Earth API integration

- Add data_sources.yaml for configurable data source URLs
- Add data_sources.py to load config with database override support
- Add arcgis_landing_points and arcgis_cable_landing_relation collectors
- Change visualization API to query arcgis_landing_points
- Add /api/v1/datasources/configs/all endpoint
- Update Earth to fetch from API instead of static files
- Fix scheduler collector ID mappings

frontend/public/earth/js/constants.js

@@ -9,9 +9,11 @@ export const CONFIG = {
   rotationSpeed: 0.002,
 };
 
-// Paths
 export const PATHS = {
+  cablesApi: '/api/v1/visualization/geo/cables',
+  landingPointsApi: '/api/v1/visualization/geo/landing-points',
   geoJSON: './geo.json',
+  landingPointsStatic: './landing-point-geo.geojson',
 };
 
 // Cable colors mapping