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/parcel-sync/components/tabs/map-tab.tsx

@@ -46,7 +46,6 @@ const BASE_LAYERS = [
   "l-terenuri-label",
   "l-cladiri-fill",
   "l-cladiri-line",
-  "l-cladiri-label",
 ];
 
 /* ------------------------------------------------------------------ */