feat(gui): add enable-Web-API toggle and web port settings

- new "Web API settings" section after security settings in the Swing
  options panel: checkbox bound to webUI plus a port text field bound
  to webPort (empty -> default 4665; non-numeric or out of 0-65535
  shows an invalid-port warning and aborts the save)
- load handler fills both controls from the current config item
- add i18n keys to klalb_zh_CN / klalb_en_US bundles
- include previously missing webUI/webPort fields in
  KLALBControllerConfigItem equals/hashCode

src/klalb_zh_CN.properties

@@ -111,4 +111,8 @@ performancesettings=性能设置
 performancestrategy=性能策略
 singlecore=单核-缓存命中率优先（高能耗比，适合低功耗设备、云机）
 multifill=多核-负载按顺序填充（适合大多数物理服务器、电脑）
-multiscatter=多核-负载均匀打散分配（适合特殊的多路NUMA服务器）
+multiscatter=多核-负载均匀打散分配（适合特殊的多路NUMA服务器）
+webapisettings=Web API \u8bbe\u7f6e
+enablewebapi=\u542f\u7528 Web API
+webport=Web \u7aef\u53e3
+invaildwebport=\u65e0\u6548\u7684 Web \u7aef\u53e3\u53f7