fix(clients): hide WireGuard config after detaching the WG inbound

The client info and QR modals rendered a WireGuard config whenever the
client still carried leftover WG key material (privateKey / publicKey /
allowedIPs / preSharedKey / keepAlive), regardless of whether a WireGuard
inbound was actually attached. After detaching the WG inbound the config
kept showing, built with an empty endpoint port and public key.

Gate wgConfigText on an attached WireGuard inbound (wgInbound) being
present, not just isWireguardClient(client), in both ClientInfoModal and
ClientQrModal.

Also rename the i18n key pages.clients.conf -> config and add the missing
pages.clients keys (wireguardConfig, config, bulkFlow, bulkFlowNoChange,
bulkFlowDisable) to all 12 non-English locales so each one matches en-US.

internal/web/translation/id-ID.json

@@ -718,6 +718,8 @@
       "tabBasics": "Dasar",
       "tabCredentials": "Kredensial",
       "tabLinks": "Tautan",
+      "wireguardConfig": "Konfigurasi WireGuard",
+      "config": "Konfigurasi",
       "linksHint": "Tambahkan tautan berbagi pihak ketiga dan URL langganan jarak jauh untuk disertakan dalam langganan klien ini.",
       "addExternalLink": "Tambah Tautan Eksternal",
       "addExternalSubscription": "Tambah Langganan Eksternal",
@@ -871,6 +873,9 @@
       "bulkAdjustNothing": "Setel hari atau trafik sebelum menerapkan.",
       "addDays": "Tambah hari",
       "addTrafficGB": "Tambah trafik (GB)",
+      "bulkFlow": "Atur flow",
+      "bulkFlowNoChange": "Tanpa perubahan",
+      "bulkFlowDisable": "Nonaktifkan (hapus flow)",
       "delDepleted": "Hapus yang habis",
       "delDepletedConfirmTitle": "Hapus klien yang habis?",
       "delDepletedConfirmContent": "Hapus setiap klien yang kuota lalu lintasnya habis atau yang masa berlakunya telah berakhir. Tidak dapat dibatalkan.",