feat(monitor): add Sync All Romania + live GIS stats

- /api/eterra/stats: lightweight polling endpoint (8 parallel Prisma queries, 30s poll)
- /api/eterra/sync-all-counties: iterates all counties in DB sequentially,
  syncs TERENURI + CLADIRI + INTRAVILAN + enrichment (magic mode) per UAT
- Monitor page: live stat cards (UATs, parcels, buildings, DB size),
  Sync All Romania button with progress tracking at county+UAT level
- Concurrency guard: blocks county sync while all-Romania sync runs

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

src/app/api/eterra/sync-county/route.ts

@@ -26,7 +26,7 @@ export const runtime = "nodejs";
 export const dynamic = "force-dynamic";
 
 /* Concurrency guard */
-const g = globalThis as { __countySyncRunning?: string };
+const g = globalThis as { __countySyncRunning?: string; __allCountiesSyncRunning?: boolean };
 
 export async function POST(req: Request) {
   let body: { county?: string };
@@ -51,6 +51,13 @@ export async function POST(req: Request) {
     return Response.json({ error: "Judetul lipseste" }, { status: 400 });
   }
 
+  if (g.__allCountiesSyncRunning) {
+    return Response.json(
+      { error: "Sync All Romania in curs — asteapta sa se termine" },
+      { status: 409 },
+    );
+  }
+
   if (g.__countySyncRunning) {
     return Response.json(
       { error: `Sync judet deja in curs: ${g.__countySyncRunning}` },