feat: add parcel-sync module (eTerra ANCPI integration with PostGIS)

- 31 eTerra layer catalog (terenuri, cladiri, documentatii, administrativ)
- Incremental sync engine (OBJECTID comparison, only downloads new features)
- PostGIS-ready Prisma schema (GisFeature, GisSyncRun, GisUat models)
- 7 API routes (/api/eterra/login, count, sync, features, layers/summary, progress, sync-status)
- Full UI with 3 tabs (Sincronizare, Parcele, Istoric)
- Env var auth (ETERRA_USERNAME / ETERRA_PASSWORD)
- Real-time sync progress tracking with polling

src/config/flags.ts

@@ -114,6 +114,14 @@ export const DEFAULT_FLAGS: FeatureFlag[] = [
     category: "module",
     overridable: true,
   },
+  {
+    key: "module.parcel-sync",
+    enabled: true,
+    label: "eTerra Parcele",
+    description: "Sincronizare parcele cadastrale din eTerra ANCPI",
+    category: "module",
+    overridable: true,
+  },
 
   // System flags
   {