fix(monitor): increase rebuild timeout to 30min + fix sample tile z14→z17

Martin now starts at z17, so z14 sample tile returned 404.
Rebuild timeout increased from 15 to 30 min for z16 builds.

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

src/app/api/geoportal/monitor/route.ts

@@ -51,7 +51,7 @@ async function fetchWithTimeout(url: string, timeoutMs = 5000): Promise<Response
 // Sample tile coordinates for cache testing (Romania, z8)
 const SAMPLE_TILES = [
   { z: 8, x: 143, y: 91, source: "gis_uats_z8" },
-  { z: 14, x: 9205, y: 5965, source: "gis_terenuri" },
+  { z: 17, x: 73640, y: 47720, source: "gis_terenuri" },
 ];
 
 export async function GET() {