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

backend/app/api/v1/visualization.py

@@ -146,14 +146,14 @@ async def get_cables_geojson(db: AsyncSession = Depends(get_db)):
 async def get_landing_points_geojson(db: AsyncSession = Depends(get_db)):
     """获取登陆点 GeoJSON 数据 (Point)"""
     try:
-        stmt = select(CollectedData).where(CollectedData.source == "fao_landing_points")
+        stmt = select(CollectedData).where(CollectedData.source == "arcgis_landing_points")
         result = await db.execute(stmt)
         records = result.scalars().all()
 
         if not records:
             raise HTTPException(
                 status_code=404,
-                detail="No landing point data found. Please run the fao_landing_points collector first.",
+                detail="No landing point data found. Please run the arcgis_landing_points collector first.",
             )
 
         return convert_landing_point_to_geojson(records)
@@ -170,7 +170,7 @@ async def get_all_geojson(db: AsyncSession = Depends(get_db)):
     cables_result = await db.execute(cables_stmt)
     cables_records = cables_result.scalars().all()
 
-    points_stmt = select(CollectedData).where(CollectedData.source == "fao_landing_points")
+    points_stmt = select(CollectedData).where(CollectedData.source == "arcgis_landing_points")
     points_result = await db.execute(points_stmt)
     points_records = points_result.scalars().all()
 
@@ -208,7 +208,7 @@ async def get_cable_graph(db: AsyncSession) -> CableGraph:
         cables_result = await db.execute(cables_stmt)
         cables_records = list(cables_result.scalars().all())
 
-        points_stmt = select(CollectedData).where(CollectedData.source == "fao_landing_points")
+        points_stmt = select(CollectedData).where(CollectedData.source == "arcgis_landing_points")
         points_result = await db.execute(points_stmt)
         points_records = list(points_result.scalars().all())