feat(parcel-sync): native PostGIS geometry support for QGIS

- Remove postgresqlExtensions/postgis from Prisma schema (PostGIS not yet installed)
- Add prisma/postgis-setup.sql: trigger auto-converts GeoJSON→native geometry,
  GiST spatial index, QGIS-friendly views (gis_terenuri, gis_cladiri, etc.)
- Add POST /api/eterra/setup-postgis endpoint (idempotent, runs all SQL setup)
- Add safety-net raw SQL in sync-service: backfills geom after upsert phase
- Add QGIS/PostGIS setup card in layer catalog UI with connection info
- Schema comment documents the trigger-managed 'geom' column approach

src/modules/parcel-sync/services/sync-service.ts

@@ -221,6 +221,17 @@ export async function syncLayer(
       });
     }
 
+    // Populate native PostGIS geometry (safety net if trigger not installed)
+    try {
+      await prisma.$executeRaw`
+        UPDATE "GisFeature"
+        SET geom = ST_SetSRID(ST_GeomFromGeoJSON(geometry::text), 3844)
+        WHERE "layerId" = ${layerId} AND siruta = ${siruta}
+          AND geometry IS NOT NULL AND geom IS NULL`;
+    } catch {
+      // PostGIS not available yet — not critical, skip silently
+    }
+
     // Mark removed features
     if (removedObjIds.length > 0) {
       push({ phase: "Marcare șterse" });