feat(parcel-sync): store UAT geometries from LIMITE_UAT in local DB

- Add geometry (Json), areaValue (Float), lastUpdatedDtm (String) to
  GisUat model for local caching of UAT boundaries
- County refresh now fetches LIMITE_UAT with returnGeometry=true and
  stores EsriGeometry rings per UAT in EPSG:3844
- Uses LAST_UPDATED_DTM from eTerra for future incremental sync
- Skips geometry fetch if >50% already have geometry stored

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

prisma/schema.prisma

@@ -73,11 +73,14 @@ model GisSyncRun {
 }
 
 model GisUat {
-  siruta      String   @id
-  name        String
-  county      String?
-  workspacePk Int?
-  updatedAt   DateTime @updatedAt
+  siruta         String   @id
+  name           String
+  county         String?
+  workspacePk    Int?
+  geometry       Json?    /// EsriGeometry { rings: number[][][] } in EPSG:3844
+  areaValue      Float?   /// Area in sqm from LIMITE_UAT AREA_VALUE field
+  lastUpdatedDtm String?  /// LAST_UPDATED_DTM from eTerra — for incremental sync
+  updatedAt      DateTime @updatedAt
 
   @@index([name])
   @@index([county])