chore(i18n): remove restart prompt from provider switch notification

Claude Code now supports hot reload, so users no longer need to restart
the terminal after switching providers. Also removes unused `restartClaude`
i18n string.

src/i18n/locales/en.json

@@ -112,7 +112,7 @@
     "providerAdded": "Provider added",
     "providerSaved": "Provider configuration saved",
     "providerDeleted": "Provider deleted successfully",
-    "switchSuccess": "Switch successful! Please restart {{appName}} terminal to take effect",
+    "switchSuccess": "Switch successful!",
     "switchFailedTitle": "Switch failed",
     "switchFailed": "Switch failed: {{error}}",
     "autoImported": "Default provider created from existing configuration",
@@ -541,9 +541,6 @@
     "env": "Environment (one per line, KEY=VALUE)",
     "envPlaceholder": "FOO=bar\nHELLO=world",
     "reset": "Reset",
-    "notice": {
-      "restartClaude": "Written. Restart Claude to take effect."
-    },
     "msg": {
       "saved": "Saved",
       "deleted": "Deleted",

src/i18n/locales/ja.json

@@ -112,7 +112,7 @@
     "providerAdded": "プロバイダーを追加しました",
     "providerSaved": "プロバイダー設定を保存しました",
     "providerDeleted": "プロバイダーを削除しました",
-    "switchSuccess": "切り替え成功！ {{appName}} ターミナルを再起動すると反映されます",
+    "switchSuccess": "切り替え成功！",
     "switchFailedTitle": "切り替えに失敗しました",
     "switchFailed": "切り替えに失敗しました: {{error}}",
     "autoImported": "既存設定からデフォルトプロバイダーを自動作成しました",
@@ -541,9 +541,6 @@
     "env": "環境変数（1 行に 1 件、KEY=VALUE）",
     "envPlaceholder": "FOO=bar\nHELLO=world",
     "reset": "リセット",
-    "notice": {
-      "restartClaude": "書き込みました。Claude を再起動すると反映されます。"
-    },
     "msg": {
       "saved": "保存しました",
       "deleted": "削除しました",

src/i18n/locales/zh.json

@@ -112,7 +112,7 @@
     "providerAdded": "供应商已添加",
     "providerSaved": "供应商配置已保存",
     "providerDeleted": "供应商删除成功",
-    "switchSuccess": "切换成功！请重启 {{appName}} 终端以生效",
+    "switchSuccess": "切换成功！",
     "switchFailedTitle": "切换失败",
     "switchFailed": "切换失败：{{error}}",
     "autoImported": "已从现有配置创建默认供应商",
@@ -541,9 +541,6 @@
     "env": "环境变量 (一行一个，KEY=VALUE)",
     "envPlaceholder": "FOO=bar\nHELLO=world",
     "reset": "重置",
-    "notice": {
-      "restartClaude": "已写入配置，重启 Claude 生效"
-    },
     "msg": {
       "saved": "已保存",
       "deleted": "已删除",