chore: rename "DNS Settings" to "DNS Overwrite" in UI for consistency

This change updates the label for the DNS toggle setting from "DNS Settings" to "DNS Overwrite"
in the ClashVerge settings interface. The change provides better consistency with the translation
keys and more clearly communicates the function of the setting, which is to override system DNS.
The corresponding translation keys have been updated in both English and Chinese localization files.

src/components/setting/setting-clash.tsx

@@ -135,7 +135,7 @@ const SettingClash = ({ onError }: Props) => {
       </SettingItem>
 
       <SettingItem
-        label={t("DNS Settings")}
+        label={t("DNS Overwrite")}
         extra={
           <TooltipIcon
             icon={SettingsRounded}