revert: disable building labels + remove debug endpoints

Building labels (C1/C2/C3) disabled — Martin MVT tiles don't include
cadastral_ref as a property despite the PostgreSQL view exposing it.
Root cause needs investigation (Martin config or alternative tile server).

Removed temporary debug endpoints:
- /api/eterra/debug-tile-props
- /api/eterra/debug-tile-sample

Kept /api/eterra/debug-fields (useful long-term diagnostic).

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/modules/geoportal/components/map-viewer.tsx

@@ -58,7 +58,6 @@ const LAYER_IDS = {
   terenuriLabel: "l-terenuri-label",
   cladiriFill: "l-cladiri-fill",
   cladiriLine: "l-cladiri-line",
-  cladiriLabel: "l-cladiri-label",
   selectionFill: "l-selection-fill",
   selectionLine: "l-selection-line",
   drawPolygonFill: "l-draw-polygon-fill",
@@ -439,15 +438,9 @@ export const MapViewer = forwardRef<MapViewerHandle, MapViewerProps>(
           paint: { "fill-color": "#3b82f6", "fill-opacity": 0.5 } });
         map.addLayer({ id: LAYER_IDS.cladiriLine, type: "line", source: SOURCES.cladiri, "source-layer": SOURCES.cladiri, minzoom: 14,
           paint: { "line-color": "#1e3a5f", "line-width": 0.6 } });
-        // Building body labels — use SAME source as terenuri to test rendering
-        // If this works with terenuri source, problem is with gis_cladiri tiles
-        map.addLayer({ id: LAYER_IDS.cladiriLabel, type: "symbol", source: SOURCES.cladiri, "source-layer": SOURCES.cladiri, minzoom: 15,
-          layout: {
-            "text-field": "{cadastral_ref}",
-            "text-font": ["Noto Sans Regular"],
-            "text-size": 9, "text-anchor": "top", "text-offset": [0, 1],
-          },
-          paint: { "text-color": "#dc2626", "text-halo-color": "#fff", "text-halo-width": 2 } });
+        // TODO: Building body labels (C1, C2...) — disabled pending Martin tile investigation
+        // Martin MVT tiles don't include cadastral_ref as a property despite the view exposing it.
+        // Next step: evaluate alternatives (pg_tileserv, GeoJSON source, Martin config).
 
         // === Selection highlight ===
         map.addLayer({ id: LAYER_IDS.selectionFill, type: "fill", source: SOURCES.terenuri, "source-layer": SOURCES.terenuri, minzoom: 13,