feat: add Russian localization and independent STT languages

src/server/language.ts

@@ -0,0 +1,9 @@
+import { resolveLanguage, type Language } from "../core/i18n.ts";
+import { stores } from "./stores.ts";
+/** Explicit app preference wins; automatic follow-ups retain the foreground browser's language. */
+export function applicationLanguage(system?: string | null): Language {
+	return resolveLanguage(stores.settingsStore.readSettings()?.general?.language, system ?? process.env.LH_SYSTEM_LANGUAGE ?? Intl.DateTimeFormat().resolvedOptions().locale);
+}
+export function chatLanguage(chatId: string): Language {
+	return applicationLanguage(stores.chatStore.getChat(chatId)?.language);
+}