feat: complete Wallonia land cover and terrain sources

backend/app/services/coverage_registry_service.py

@@ -253,10 +253,10 @@ SOURCE_DEFINITIONS = (
         license_note="Consult the license of each Geoportail Wallonie product.",
         limitation_message=(
             "Bounded PICC buildings, road axes and hydrography, the legally current flood-hazard polygons, "
-            "and operator-imported SPW bathymetry are operational; other Walloon themes remain separately governed."
+            "operator-imported SPW bathymetry and bounded SPW MNT terrain are operational; other Walloon themes remain separately governed."
         ),
-        materialized_source_names=("spw_picc", "spw_flood_hazard", "spw_walous_land_cover", "spw_bathymetry"),
-        operational_themes=("buildings", "roads", "surface_water", "land_cover_use", "flood_climate", "bathymetry"),
+        materialized_source_names=("spw_picc", "spw_flood_hazard", "spw_walous_land_cover", "spw_bathymetry", "spw_terrain"),
+        operational_themes=("buildings", "roads", "surface_water", "land_cover_use", "elevation", "flood_climate", "bathymetry"),
     ),
     _contract(
         source_name="urbis",
@@ -376,6 +376,7 @@ REGIONAL_THEME_DATASETS: dict[str, dict[str, dict[str, tuple[str, ...]]]] = {
         "roads": {"spw_picc": ("roads",)},
         "surface_water": {"spw_picc": ("water",)},
         "land_cover_use": {"spw_walous_land_cover": ()},
+        "elevation": {"spw_terrain": ()},
         "flood_climate": {"spw_flood_hazard": ("flood_hazard",)},
         "bathymetry": {"spw_bathymetry": ()},
     },