feat(config): make ArcGIS data source URLs configurable

- Add ARCGIS_CABLE_URL, ARCGIS_LANDING_POINT_URL, ARCGIS_CABLE_LANDING_RELATION_URL to config
- Use @property to read URL from settings in collectors
- URLs can now be configured via environment variables

backend/app/services/collectors/arcgis_landing.py

@@ -1,12 +1,9 @@
-"""ArcGIS Landing Points Collector
-
-Collects landing point data from ArcGIS GeoJSON API.
-"""
-
 from typing import Dict, Any, List
 from datetime import datetime
+import httpx
 
 from app.services.collectors.base import BaseCollector
+from app.core.config import settings
 
 
 class ArcGISLandingPointCollector(BaseCollector):
@@ -16,21 +13,18 @@ class ArcGISLandingPointCollector(BaseCollector):
     frequency_hours = 168
     data_type = "landing_point"
 
-    base_url = "https://services.arcgis.com/6DIQcwlPy8knb6sg/arcgis/rest/services/SubmarineCables/FeatureServer/1/query"
+    @property
+    def base_url(self) -> str:
+        return settings.ARCGIS_LANDING_POINT_URL
 
     async def fetch(self) -> List[Dict[str, Any]]:
         params = {"where": "1=1", "outFields": "*", "returnGeometry": "true", "f": "geojson"}
 
-        async with self._get_client() as client:
+        async with httpx.AsyncClient(timeout=60.0) as client:
             response = await client.get(self.base_url, params=params)
             response.raise_for_status()
             return self.parse_response(response.json())
 
-    def _get_client(self):
-        import httpx
-
-        return httpx.AsyncClient(timeout=60.0)
-
     def parse_response(self, data: Dict[str, Any]) -> List[Dict[str, Any]]:
         result = []