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

prisma/postgis-setup.sql

@@ -0,0 +1,115 @@
+-- =============================================================================
+-- PostGIS native geometry setup for GisFeature
+-- Run once via POST /api/eterra/setup-postgis (idempotent — safe to re-run)
+--
+-- What this does:
+--   1. Ensures PostGIS extension
+--   2. Adds native geometry column (geom) if missing
+--   3. Creates trigger to auto-convert GeoJSON → native on INSERT/UPDATE
+--   4. Backfills existing features that have JSON geometry but no native geom
+--   5. Creates GiST spatial index for fast spatial queries
+--   6. Creates QGIS-friendly views with clean column names
+-- =============================================================================
+
+-- 1. Ensure PostGIS extension
+CREATE EXTENSION IF NOT EXISTS postgis;
+
+-- 2. Add native geometry column (idempotent)
+DO $$
+BEGIN
+  IF NOT EXISTS (
+    SELECT 1 FROM information_schema.columns
+    WHERE table_name = 'GisFeature' AND column_name = 'geom'
+  ) THEN
+    ALTER TABLE "GisFeature" ADD COLUMN geom geometry(Geometry, 3844);
+  END IF;
+END $$;
+
+-- 3. Trigger function: auto-convert GeoJSON (geometry JSON column) → native PostGIS (geom)
+CREATE OR REPLACE FUNCTION gis_feature_sync_geom()
+RETURNS TRIGGER AS $$
+BEGIN
+  IF NEW.geometry IS NOT NULL THEN
+    BEGIN
+      NEW.geom := ST_SetSRID(ST_GeomFromGeoJSON(NEW.geometry::text), 3844);
+    EXCEPTION WHEN OTHERS THEN
+      -- Invalid GeoJSON → leave geom NULL rather than fail the write
+      NEW.geom := NULL;
+    END;
+  ELSE
+    NEW.geom := NULL;
+  END IF;
+  RETURN NEW;
+END;
+$$ LANGUAGE plpgsql;
+
+-- 4. Attach trigger (drop + recreate for idempotency)
+DROP TRIGGER IF EXISTS trg_gis_feature_sync_geom ON "GisFeature";
+CREATE TRIGGER trg_gis_feature_sync_geom
+  BEFORE INSERT OR UPDATE OF geometry ON "GisFeature"
+  FOR EACH ROW
+  EXECUTE FUNCTION gis_feature_sync_geom();
+
+-- 5. Backfill: convert existing JSON geometries to native
+UPDATE "GisFeature"
+SET geom = ST_SetSRID(ST_GeomFromGeoJSON(geometry::text), 3844)
+WHERE geometry IS NOT NULL AND geom IS NULL;
+
+-- 6. GiST spatial index for fast bounding-box / intersection queries
+CREATE INDEX IF NOT EXISTS gis_feature_geom_idx
+  ON "GisFeature" USING GIST (geom);
+
+-- =============================================================================
+-- 7. QGIS-friendly views
+--    - Clean snake_case column names
+--    - Only rows with valid geometry
+--    - One master view + per-category views
+-- =============================================================================
+
+-- Master view: all features
+CREATE OR REPLACE VIEW gis_features AS
+SELECT
+  id,
+  "layerId"      AS layer_id,
+  siruta,
+  "objectId"     AS object_id,
+  "inspireId"    AS inspire_id,
+  "cadastralRef" AS cadastral_ref,
+  "areaValue"    AS area_value,
+  "isActive"     AS is_active,
+  attributes,
+  "projectId"    AS project_id,
+  "createdAt"    AS created_at,
+  "updatedAt"    AS updated_at,
+  geom
+FROM "GisFeature"
+WHERE geom IS NOT NULL;
+
+-- Terenuri (parcels)
+CREATE OR REPLACE VIEW gis_terenuri AS
+SELECT * FROM gis_features
+WHERE layer_id LIKE 'TERENURI%' OR layer_id LIKE 'CADGEN_LAND%';
+
+-- Clădiri (buildings)
+CREATE OR REPLACE VIEW gis_cladiri AS
+SELECT * FROM gis_features
+WHERE layer_id LIKE 'CLADIRI%' OR layer_id LIKE 'CADGEN_BUILDING%';
+
+-- Documentații (expertize, zone interes, recepții)
+CREATE OR REPLACE VIEW gis_documentatii AS
+SELECT * FROM gis_features
+WHERE layer_id LIKE 'EXPERTIZA%'
+   OR layer_id LIKE 'ZONE_INTERES%'
+   OR layer_id LIKE 'RECEPTII%';
+
+-- Administrativ (limite UAT, intravilan, arii speciale)
+CREATE OR REPLACE VIEW gis_administrativ AS
+SELECT * FROM gis_features
+WHERE layer_id LIKE 'LIMITE%'
+   OR layer_id LIKE 'SPECIAL_AREAS%';
+
+-- =============================================================================
+-- Done! QGIS connection: PostgreSQL → 10.10.10.166:5432 / architools_db
+-- Add layers from views: gis_terenuri, gis_cladiri, gis_documentatii, etc.
+-- SRID: 3844 (Stereo70)
+-- =============================================================================