feat(web): add /api/node-info endpoint for on-demand node detail queries

- Expose GET /api/node-info?address=<ipv6> endpoint in KLALBWebServer
- Return local deviceName and deviceDescription immediately for self node
- Perform asynchronous full node-info query (NODE_INFO_FULL_REQ) via
  KLALBRoutingProtocolAPIClient for remote nodes with 3s timeout fallback

src/org/kne/cloud/network/klalb/web/KLALBWebServer.java

@@ -19,8 +19,10 @@ import org.kne.cloud.network.ipv6.IPv6NetworkLink;
 import org.kne.cloud.network.ipv6.RouteItem;
 import org.kne.cloud.network.klalb.*;
 import org.kne.cloud.network.monitor.LinkStatus;
+import org.kne.cloud.network.srv6.KLALBNodeInformation;
 import org.kne.cloud.network.srv6.KLALBRoutingProtocol;
 import org.kne.cloud.network.srv6.KLALBRoutingProtocol.LinkDirection;
+import org.kne.cloud.network.srv6.KLALBRoutingProtocolAPIClient;
 import org.kne.cloud.network.srv6.NeighborInfo;
 import org.kne.cloud.network.srv6.RouterInfo;
 import org.kne.cloud.network.srv6.SRv6Router;
@@ -68,6 +70,7 @@ public class KLALBWebServer {
 		server.createContext("/api/links/reconnect", this::handleReconnectAll);
 		server.createContext("/api/routes", this::handleRoutes);
 		server.createContext("/api/nodes", this::handleNodes);
+		server.createContext("/api/node-info", this::handleNodeInfo);
 		server.createContext("/api/interfaces", this::handleInterfaces);
 		server.createContext("/api/config", this::handleConfig);
 
@@ -453,6 +456,119 @@ public class KLALBWebServer {
 		sendJsonResponse(exchange, 200, routesArray);
 	}
 
+	private KLALBRoutingProtocolAPIClient nodeInfoClient;
+
+	private synchronized KLALBRoutingProtocolAPIClient getNodeInfoClient(KLALBController kc) {
+		if (nodeInfoClient == null) {
+			nodeInfoClient = new KLALBRoutingProtocolAPIClient(kc.getIpv6Router().getKlalbRouteProtol());
+		}
+		return nodeInfoClient;
+	}
+
+	private void handleNodeInfo(HttpExchange exchange) throws IOException {
+		if (handleCorsPreflight(exchange)) return;
+		if (!"GET".equalsIgnoreCase(exchange.getRequestMethod())) {
+			sendError(exchange, 405, "Method not allowed");
+			return;
+		}
+
+		Map<String, String> params = parseQuery(exchange.getRequestURI().getRawQuery());
+		String addressStr = params.get("address");
+		if (addressStr == null || addressStr.trim().isEmpty()) {
+			sendError(exchange, 400, "address parameter is required");
+			return;
+		}
+
+		KLALBController kc = proxySystem.getKlalbController();
+		if (kc == null || kc.getIpv6Router() == null || kc.getIpv6Router().getKlalbRouteProtol() == null) {
+			sendError(exchange, 503, "Controller not ready");
+			return;
+		}
+
+		IPv6Address target;
+		try {
+			target = new IPv6Address((Inet6Address) InetAddress.getByName(addressStr.trim()));
+		} catch (Exception e) {
+			sendError(exchange, 400, "Invalid IPv6 address: " + addressStr);
+			return;
+		}
+
+		SRv6Router router = kc.getIpv6Router();
+		boolean isSelf = router.getLocator().getAddress().equals(target);
+
+		JsonObject resp = new JsonObject();
+		resp.addProperty("address", target.toString());
+
+		if (isSelf) {
+			// 本机：描述直接取本地控制器配置
+			KLALBControllerConfigItem cfg = proxySystem.getControllerConfig();
+			resp.addProperty("isSelf", true);
+			String dname = router.getDeviceName() != null ? router.getDeviceName()
+					: (cfg != null && cfg.getDeviceName() != null ? cfg.getDeviceName() : "");
+			resp.addProperty("deviceName", dname);
+			resp.addProperty("deviceDescription",
+					cfg != null && cfg.getDeviceDescription() != null ? cfg.getDeviceDescription() : "");
+			JsonArray lines = new JsonArray();
+			for (MultiProtocolSocketAddress mpsa : kc.getExternalEndpoints()) {
+				lines.add(new JsonPrimitive(mpsa.toString()));
+			}
+			resp.add("openLines", lines);
+			sendJsonResponse(exchange, 200, resp);
+			return;
+		}
+
+		// 远端节点：经 SRv6 虚拟网络发送完整节点信息查询（异步回调，限时等待）
+		resp.addProperty("isSelf", false);
+		CompletableFuture<KLALBNodeInformation> future = new CompletableFuture<>();
+		try {
+			getNodeInfoClient(kc).requestNodeInfoFull(
+					new InetSocketAddress(target.toInet6Address(), KLALBRoutingProtocol.DEFAULT_PORT),
+					info -> future.complete(info));
+
+			KLALBNodeInformation info;
+			try {
+				info = future.get(3, TimeUnit.SECONDS);
+			} catch (TimeoutException te) {
+				info = null;
+			}
+
+			String dname = info != null && info.getDeviceName() != null && !info.getDeviceName().isEmpty()
+					? info.getDeviceName()
+					: router.getKlalbRouteProtol().getDeviceName(target);
+			resp.addProperty("deviceName", dname != null ? dname : "");
+			resp.addProperty("deviceDescription",
+					info != null && info.getDeviceDescription() != null ? info.getDeviceDescription() : "");
+			resp.addProperty("reachable", info != null);
+			JsonArray lines = new JsonArray();
+			if (info != null && info.getOpenLines() != null) {
+				for (MultiProtocolSocketAddress mpsa : info.getOpenLines()) {
+					lines.add(new JsonPrimitive(mpsa.toString()));
+				}
+			}
+			resp.add("openLines", lines);
+		} catch (Exception e) {
+			resp.addProperty("deviceName", "");
+			resp.addProperty("deviceDescription", "");
+			resp.addProperty("reachable", false);
+			resp.add("openLines", new JsonArray());
+		}
+		sendJsonResponse(exchange, 200, resp);
+	}
+
+	private Map<String, String> parseQuery(String rawQuery) {
+		Map<String, String> params = new HashMap<>();
+		if (rawQuery == null || rawQuery.isEmpty()) return params;
+		for (String pair : rawQuery.split("&")) {
+			int idx = pair.indexOf('=');
+			if (idx <= 0) continue;
+			try {
+				params.put(URLDecoder.decode(pair.substring(0, idx), StandardCharsets.UTF_8),
+						URLDecoder.decode(pair.substring(idx + 1), StandardCharsets.UTF_8));
+			} catch (Exception ignored) {}
+		}
+		return params;
+	}
+
 	private void handleNodes(HttpExchange exchange) throws IOException {
 		if (handleCorsPreflight(exchange)) return;
 		if (!"GET".equalsIgnoreCase(exchange.getRequestMethod())) {