feat(openwrt): add OpenWrt gateway status view and get-status RPC

Backend: new `openwrt.get-status` RPC endpoint SSHes into the saved (or
provided) OpenWrt router and returns system info, TollGate config, and WiFi
AP interfaces via UCI.

Frontend: new OpenWrtGateway.vue view at /dashboard/server/openwrt shows
system hostname, OpenWrt version, uptime, TollGate install/enable state with
pricing and mint URL, and all AP-mode WiFi interfaces. Linked from the Local
Network section of the Server view.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

neode-ui/src/router/index.ts

@@ -176,6 +176,11 @@ const router = createRouter({
           name: 'server',
           component: () => import('../views/Server.vue'),
         },
+        {
+          path: 'server/openwrt',
+          name: 'openwrt-gateway',
+          component: () => import('../views/server/OpenWrtGateway.vue'),
+        },
         {
           path: 'monitoring',
           name: 'monitoring',