fix(ui): add CUSTOM_ROUTER_PATH support in general settings

- Add CUSTOM_ROUTER_PATH field to UI configuration
  - Fix configuration preservation during save operations

ui/src/locales/en.json

@@ -42,7 +42,9 @@
     "port": "Port",
     "apikey": "API Key",
     "timeout": "API Timeout (ms)",
-    "proxy_url": "Proxy URL"
+    "proxy_url": "Proxy URL",
+    "custom_router_path": "Custom Router Script Path",
+    "custom_router_path_placeholder": "Enter absolute path to custom router script file"
   },
   "transformers": {
     "title": "Custom Transformers",

ui/src/locales/zh.json

@@ -42,7 +42,9 @@
     "port": "端口",
     "apikey": "API 密钥",
     "timeout": "API 超时时间 (毫秒)",
-    "proxy_url": "代理地址"
+    "proxy_url": "代理地址",
+    "custom_router_path": "自定义路由脚本路径",
+    "custom_router_path_placeholder": "输入自定义路由脚本文件的绝对路径"
   },
   "transformers": {
     "title": "自定义转换器",