feat(home): surface TollGate status on the Network tile

Add a TollGate row (Enabled/Disabled/Not installed) to the Home
dashboard's Network tile, polling the existing openwrt.get-status RPC
on the same cadence as the other network rows. Only rendered once an
OpenWrt router is actually configured, so nodes without one aren't
cluttered with an always-"Not configured" row.

Also fixes the underlying reason this could never have worked: nothing
in the OpenWrt Gateway flow ever persisted the router's host/credentials
server-side — the "connect" form only kept them in local component
state, so any no-args openwrt.get-status call (this new tile, and even
the Gateway page's own reload) always failed with "No router
configured" despite a fully working, provisioned router. Now
handle_openwrt_get_status saves the connection to router_config.json
whenever a host is explicitly passed in and the connection succeeds.

core/archipelago/src/api/rpc/openwrt.rs

@@ -53,6 +53,7 @@ impl RpcHandler {
     ) -> Result<serde_json::Value> {
         let saved = net_router::load_router_config(&self.config.data_dir).await?;
         let p = params.unwrap_or_default();
+        let host_from_params = p.get("host").and_then(|v| v.as_str()).is_some();
 
         let host = p
             .get("host")
@@ -78,6 +79,22 @@ impl RpcHandler {
         let router = Router::connect_password(&host, 22, &ssh_user, &ssh_password)?;
         router.verify_openwrt()?;
 
+        // Persist the connection so other views (e.g. the Home dashboard's
+        // Network tile) can poll `openwrt.get-status` with no params instead
+        // of every caller needing to carry host/credentials around. Only do
+        // this when the host actually came from params — otherwise every
+        // no-args poll would re-save the same thing it just read.
+        if host_from_params {
+            let _ = net_router::configure_router(
+                &self.config.data_dir,
+                net_router::RouterType::OpenWrt,
+                &host,
+                None,
+                Some(&ssh_user),
+                Some(&ssh_password),
+            ).await;
+        }
+
         // System info
         let release = router.run_ok("cat /etc/openwrt_release").unwrap_or_default();
         let hostname = router