feat: 新增常规设置页面，支持关闭行为与语言切换

新增常规设置路由和页面，实现关闭行为（每次询问/保持选择）与应用语言的持久化配置；封装卡片式单选组组件复用在关闭弹窗和设置页；修改关闭逻辑，根据关闭行为决定是否显示确认弹窗，同步更新多语言文案和类型定义。

src/i18n/locales/en-US.json

@@ -39,7 +39,12 @@
     "tray": "Minimize to system tray",
     "trayDesc": "Keep Frpilot running in the background; reopen it from the system tray",
     "exit": "Quit directly",
-    "exitDesc": "Stop the tunnel and exit Frpilot completely"
+    "exitDesc": "Stop the tunnel and exit Frpilot completely",
+    "behavior": "Close behavior",
+    "ask": "Ask every time",
+    "askDesc": "Show this dialog on every close and let you choose",
+    "remember": "Keep the choice above",
+    "rememberDesc": "Remember the close method above and never ask again"
   },
   "system": {
     "cpu": "CPU usage",
@@ -73,9 +78,20 @@
     "title": "Settings",
     "placeholder": "The settings page is under construction.",
     "menu": {
+      "general": "General",
       "appearance": "Appearance",
       "about": "About"
     },
+    "general": {
+      "title": "General",
+      "subtitle": "Basic settings such as close behavior and app language",
+      "closeBehavior": "Close behavior",
+      "closeBehaviorTip": "Choose what happens when you click the close button. Kept in sync with the close dialog.",
+      "closeAction": "Close method",
+      "closeActionTip": "Takes effect when \"Keep the choice above\" is selected. The window closes this way directly, and it is also the default option in the close dialog.",
+      "language": "Language",
+      "languageTip": "Switch the interface language. In sync with the language switcher in the title bar."
+    },
     "appearance": {
       "title": "Appearance",
       "subtitle": "Customize the theme mode and window background",

src/i18n/locales/zh-CN.json

@@ -39,7 +39,12 @@
     "tray": "最小化到系统托盘",
     "trayDesc": "保持 Frpilot 在后台运行，可从系统托盘随时打开",
     "exit": "直接退出",
-    "exitDesc": "停止穿透并完全退出 Frpilot"
+    "exitDesc": "停止穿透并完全退出 Frpilot",
+    "behavior": "关闭行为",
+    "ask": "每次询问",
+    "askDesc": "每次关闭都弹出此对话框，由你选择关闭方式",
+    "remember": "保持以上选择",
+    "rememberDesc": "记住上面的关闭方式，之后关闭不再询问"
   },
   "system": {
     "cpu": "CPU 占用",
@@ -73,9 +78,20 @@
     "title": "设置",
     "placeholder": "设置页面开发中，敬请期待。",
     "menu": {
+      "general": "常规",
       "appearance": "外观设置",
       "about": "关于"
     },
+    "general": {
+      "title": "常规",
+      "subtitle": "关闭行为与应用语言等基础设置",
+      "closeBehavior": "关闭行为",
+      "closeBehaviorTip": "设置点击关闭按钮时的处理方式，与关闭弹窗中的选项保持一致",
+      "closeAction": "关闭方式",
+      "closeActionTip": "选择「保持以上选择」后生效，关闭窗口时将直接按此方式处理，同时也作为关闭弹窗的默认选项",
+      "language": "语言",
+      "languageTip": "切换界面显示语言，与顶部栏的语言切换保持同步"
+    },
     "appearance": {
       "title": "外观设置",
       "subtitle": "自定义窗口的主题模式与背景图片",