fix(sync-county): use eTerra session credentials, not just env vars

Same pattern as sync-background: session credentials from eTerra login
take priority, env vars are fallback only.

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

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

@@ -20,6 +20,7 @@ import { enrichFeatures } from "@/modules/parcel-sync/services/enrich-service";
 import { EterraClient } from "@/modules/parcel-sync/services/eterra-client";
 import { checkEterraHealthNow } from "@/modules/parcel-sync/services/eterra-health";
 import { createAppNotification } from "@/core/notifications/app-notifications";
+import { getSessionCredentials } from "@/modules/parcel-sync/services/session-store";
 
 export const runtime = "nodejs";
 export const dynamic = "force-dynamic";
@@ -28,15 +29,6 @@ export const dynamic = "force-dynamic";
 const g = globalThis as { __countySyncRunning?: string };
 
 export async function POST(req: Request) {
-  const username = process.env.ETERRA_USERNAME ?? "";
-  const password = process.env.ETERRA_PASSWORD ?? "";
-  if (!username || !password) {
-    return Response.json(
-      { error: "ETERRA_USERNAME / ETERRA_PASSWORD nu sunt configurate" },
-      { status: 500 },
-    );
-  }
-
   let body: { county?: string };
   try {
     body = (await req.json()) as { county?: string };
@@ -44,6 +36,16 @@ export async function POST(req: Request) {
     return Response.json({ error: "Body invalid" }, { status: 400 });
   }
 
+  const session = getSessionCredentials();
+  const username = String(session?.username || process.env.ETERRA_USERNAME || "").trim();
+  const password = String(session?.password || process.env.ETERRA_PASSWORD || "").trim();
+  if (!username || !password) {
+    return Response.json(
+      { error: "Credentiale lipsa — conecteaza-te la eTerra mai intai." },
+      { status: 401 },
+    );
+  }
+
   const county = body.county?.trim();
   if (!county) {
     return Response.json({ error: "Judetul lipseste" }, { status: 400 });