refactor: reorganize project structure and improve type definitions

- Split types into separate modules for better organization
- Move data files to dedicated directories with proper documentation
- Enhance i18n utilities with better type safety and performance
- Maintain backward compatibility with legacy imports

src/types/i18n.ts

@@ -0,0 +1,36 @@
+/**
+ * Internationalization types module
+ * Contains type definitions for i18n functionality
+ */
+import { languages } from '@/i18n/translations';
+
+/**
+ * Language type definition
+ */
+export type Lang = keyof typeof languages;
+
+/**
+ * UI translation keys type
+ */
+export type UiKeys = string;
+
+/**
+ * Language switcher component props
+ */
+export interface LanguageSwitcherProps {
+  lang: Lang;
+}
+
+/**
+ * Glass header component props
+ */
+export interface GlassHeaderProps {
+  lang: Lang;
+}
+
+/**
+ * Footer component props
+ */
+export interface FooterProps {
+  lang?: Lang;
+}