✨ feat(web): integrate embedded web server, REST/SSE APIs and modernize configuration

- Add embedded KLALBWebServer with REST API, SSE streaming (200ms) and SPA hosting
- Introduce enableTUN configuration flag with fallback and non-admin execution support
- Refactor LineTable and ConnectLineTable to openConnections and autoConnections
- Rename denyLineTableQuery/Broadcast to denyConnectionQuery/Broadcast with backwards compatibility
- Support runtime config hot-reloading and automatic persistence to klalb-config.json
- Update default Web API port to 4665 and update dashboard submodule reference

src/org/kne/cloud/network/klalb/KLALBProxySystem.java

@@ -5,25 +5,35 @@ import java.io.FileReader;
 import java.io.FileWriter;
 import java.io.IOException;
 import java.io.Reader;
-import java.net.InetSocketAddress;
+import java.lang.reflect.Type;
+import java.net.InetAddress;
+import java.net.InetSocketAddress;
 import java.util.HashSet;
 
 import org.kne.cloud.network.*;
 import org.kne.cloud.network.klalb.ui.KLALBStateGUI3;
 import org.kne.cloud.network.klalb.ui.Language;
 import org.kne.cloud.network.klalb.ui.UIEnv;
+import org.kne.cloud.network.klalb.web.KLALBWebServer;
 
 import java.util.Set;
 
 import com.google.gson.Gson;
 import com.google.gson.GsonBuilder;
+import com.google.gson.JsonDeserializationContext;
+import com.google.gson.JsonDeserializer;
 import com.google.gson.JsonElement;
+import com.google.gson.JsonParseException;
+import com.google.gson.JsonPrimitive;
+import com.google.gson.JsonSerializationContext;
+import com.google.gson.JsonSerializer;
 import com.google.gson.JsonParser;
 
 public class KLALBProxySystem {
 	private Set<Proxy> proxys=new HashSet<>();
 	private KLALBController klalbController;
 	private KLALBRemoteManagement krm;
+	private KLALBWebServer webServer;
 	private KLALBConfig config;
 	private Gson gson;
 	private File jsonFile;
@@ -31,8 +41,28 @@ public class KLALBProxySystem {
 		GsonBuilder gb=new GsonBuilder().setPrettyPrinting();
 		MultiProtocolSocketAddress.registerToGsonBuilder(gb);
 		KLALBConfigItem.registerToGsonBuilder(gb);
+		gb.registerTypeAdapter(InetAddress.class, new JsonSerializer<InetAddress>() {
+			@Override
+			public JsonElement serialize(InetAddress src, Type typeOfSrc, JsonSerializationContext context) {
+				return new JsonPrimitive(src.getHostAddress());
+			}
+		});
+		gb.registerTypeAdapter(InetAddress.class, new JsonDeserializer<InetAddress>() {
+			@Override
+			public InetAddress deserialize(JsonElement json, Type typeOfT, JsonDeserializationContext context) throws JsonParseException {
+				try {
+					return InetAddress.getByName(json.getAsString());
+				} catch (Exception e) {
+					throw new JsonParseException(e);
+				}
+			}
+		});
 		gson=gb.create();
 	}
+	public Gson getGson() {
+		return gson;
+	}
+
 	public Set<Proxy> getProxys() {
 		return proxys;
 	}
@@ -81,6 +111,39 @@ public class KLALBProxySystem {
 			krm=null;
 		}
 	}
+
+	public void enableWebServer() throws IOException {
+		int port = 4665;
+		KLALBControllerConfigItem cci = getControllerConfig();
+		if (cci != null && cci.getWebPort() > 0) {
+			port = cci.getWebPort();
+		}
+		enableWebServer(port);
+	}
+
+	public void enableWebServer(int port) throws IOException {
+		if (webServer == null) {
+			webServer = new KLALBWebServer(this, port);
+			webServer.start();
+		} else {
+			throw new IllegalStateException("Web server already enabled!");
+		}
+	}
+
+	public boolean isWebServerEnabled() {
+		return webServer != null && webServer.isRunning();
+	}
+
+	public KLALBWebServer getWebServer() {
+		return webServer;
+	}
+
+	public void disableWebServer() {
+		if (webServer != null) {
+			webServer.stop();
+			webServer = null;
+		}
+	}
 	
 	public void loadConfigJson(File jsonFile) throws IOException {
 		this.jsonFile=jsonFile;
@@ -195,30 +258,24 @@ public class KLALBProxySystem {
 	}
 	
 	
+	public void saveConfigToFile() {
+		if (jsonFile != null && config != null) {
+			String json = gson.toJson(config);
+			try (FileWriter fw = new FileWriter(jsonFile)) {
+				fw.write(json);
+			} catch (IOException e) {
+				e.printStackTrace();
+			}
+		}
+	}
+
 	private KLALBStateGUI3 kgui;
 	public KLALBStateGUI3 getKLALBGUI() {
 		if(kgui==null) {
 		kgui=new KLALBStateGUI3(klalbController);
 		kgui.loadConfig(config);
 		kgui.setSaveComsumer((cfg)->{
-			String json=gson.toJson(cfg);
-			if(jsonFile!=null) {
-				FileWriter fw = null;
-				try {
-					fw=new FileWriter(jsonFile);
-					fw.write(json);
-				}catch(IOException e) {
-					e.printStackTrace();
-				}finally {
-					if(fw!=null)
-						try {
-							fw.close();
-						} catch (IOException e) {
-							e.printStackTrace();
-						}
-				}
-			}
-				
+			saveConfigToFile();
 		});
 		}
 		return kgui;