扩充多语言范围，新增7种多语言

src/components/i18n-provider.tsx

@@ -239,6 +239,7 @@ export function AppI18nProvider({
 
   useEffect(() => {
     document.documentElement.lang = activeIntlLocale
+    document.documentElement.dir = activeIntlLocale === "ar" ? "rtl" : "ltr"
   }, [activeIntlLocale])
 
   const contextValue = useMemo<AppI18nContextValue>(

src/components/settings/system-network-settings.tsx

@@ -36,9 +36,10 @@ import {
   normalizeAppUpdateError,
   relaunchApp,
 } from "@/lib/updater"
+import { APP_LOCALES } from "@/lib/i18n"
 
 const PROXY_EXAMPLE = "http://127.0.0.1:7890"
-const APP_LANGUAGE_VALUES = ["en", "zh_cn", "zh_tw"] as const
+const APP_LANGUAGE_VALUES = APP_LOCALES
 
 type LanguageSelectValue = "system" | AppLocale
 
@@ -83,6 +84,13 @@ export function SystemNetworkSettings() {
       en: tLanguage("english"),
       zh_cn: tLanguage("simplifiedChinese"),
       zh_tw: tLanguage("traditionalChinese"),
+      ja: tLanguage("japanese"),
+      ko: tLanguage("korean"),
+      es: tLanguage("spanish"),
+      de: tLanguage("german"),
+      fr: tLanguage("french"),
+      pt: tLanguage("portuguese"),
+      ar: tLanguage("arabic"),
     }),
     [tLanguage]
   )
@@ -362,6 +370,13 @@ export function SystemNetworkSettings() {
                 <SelectItem value="en">{languageLabels.en}</SelectItem>
                 <SelectItem value="zh_cn">{languageLabels.zh_cn}</SelectItem>
                 <SelectItem value="zh_tw">{languageLabels.zh_tw}</SelectItem>
+                <SelectItem value="ja">{languageLabels.ja}</SelectItem>
+                <SelectItem value="ko">{languageLabels.ko}</SelectItem>
+                <SelectItem value="es">{languageLabels.es}</SelectItem>
+                <SelectItem value="de">{languageLabels.de}</SelectItem>
+                <SelectItem value="fr">{languageLabels.fr}</SelectItem>
+                <SelectItem value="pt">{languageLabels.pt}</SelectItem>
+                <SelectItem value="ar">{languageLabels.ar}</SelectItem>
               </SelectContent>
             </Select>
           </div>