feat: add Italian language support

Added complete Italian (it) translation for the Biblical Guide application:
- Created messages/it.json with full Italian translations
- Updated i18n.ts to include Italian locale
- Updated middleware.ts to handle Italian routes
- Added Italian to language options in all locale files (en, ro, es)

Users can now access the app in Italian at /it/* routes and select Italian from the language settings.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

i18n.ts

@@ -2,14 +2,16 @@ import {getRequestConfig} from 'next-intl/server';
 import ro from './messages/ro.json';
 import en from './messages/en.json';
 import es from './messages/es.json';
+import it from './messages/it.json';
 
 // Can be imported from a shared config
-export const locales = ['en', 'ro', 'es'] as const;
+export const locales = ['en', 'ro', 'es', 'it'] as const;
 
 const messages = {
   ro,
   en,
-  es
+  es,
+  it
 } as const;
 
 export default getRequestConfig(async ({locale}) => {