feat(i18n): add internationalization support with i18next

- Add i18next and related dependencies for translation support
- Create locale files for English and Farsi languages
- Implement i18n configuration and provider in layout
- Set up route factory and constants for internationalized routes
- Remove test button components and simplify main page

public/locales/en/routes.json

@@ -0,0 +1,4 @@
+{
+  "home": "Home",
+  "about": "About"
+}

public/locales/fa/routes.json

@@ -0,0 +1,4 @@
+{
+  "home": "صفحه‌ی اصلی",
+  "about": "درباره‌ی ما"
+}