feat(gowa): tombol Test Koneksi (health, auth, jumlah device)

- service testReachability: /health + /devices
- route POST /admin/whatsapp/test-gowa-connection
- UI status warna hijau/kuning/merah
- versi 0.5.11

package.json

@@ -1,6 +1,6 @@
 {
   "name": "open-isp",
-  "version": "0.5.10",
+  "version": "0.5.11",
   "description": "OPEN-ISP \u2014 sistem billing & manajemen ISP open-source (PWA pelanggan, multi-OLT, RADIUS, WhatsApp, QRIS)",
   "main": "app-customer.js",
   "scripts": {