feat: integrate categories, countries, sources

- Added categories repository
- Added countries repository
- Added sources repository

Author: fulleni

lib/main.dart

@@ -4,12 +4,18 @@ import 'package:flutter/material.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';
 import 'package:ht_authentication_firebase/ht_authentication_firebase.dart';
 import 'package:ht_authentication_repository/ht_authentication_repository.dart';
+import 'package:ht_categories_firestore/ht_categories_firestore.dart';
+import 'package:ht_categories_repository/ht_categories_repository.dart';
+import 'package:ht_countries_firestore/ht_countries_firestore.dart';
+import 'package:ht_countries_repository/ht_countries_repository.dart';
 import 'package:ht_headlines_firestore/ht_headlines_firestore.dart';
 import 'package:ht_headlines_repository/ht_headlines_repository.dart';
 import 'package:ht_kv_storage_shared_preferences/ht_kv_storage_shared_preferences.dart';
 import 'package:ht_main/app/app.dart';
 import 'package:ht_main/bloc_observer.dart';
 import 'package:ht_main/firebase_options.dart';
+import 'package:ht_sources_firestore/ht_sources_firestore.dart';
+import 'package:ht_sources_repository/ht_sources_repository.dart';
 
 void main() async {
   WidgetsFlutterBinding.ensureInitialized();
@@ -42,12 +48,31 @@ void main() async {
   final firestore = FirebaseFirestore.instance;
   final headlinesClient = HtHeadlinesFirestore(firestore: firestore);
   final headlinesRepository = HtHeadlinesRepository(client: headlinesClient);
+
+  // 3. Categories Repository
+  final categoriesClient = HtCategoriesFirestore(firestore: firestore);
+  final categoriesRepository = HtCategoriesRepository(
+    categoriesClient: categoriesClient,
+  );
+
+  // 4. Countries Repository
+  final countriesClient = HtCountriesFirestore(firestore: firestore);
+  final countriesRepository = HtCountriesRepository(
+    countriesClient: countriesClient,
+  );
+
+  // 5. Sources Repository
+  final sourcesClient = HtSourcesFirestore(firestore: firestore);
+  final sourcesRepository = HtSourcesRepository(sourcesClient: sourcesClient);
   // --- End Instantiation ---
 
   runApp(
     App(
       htAuthenticationRepository: authenticationRepository,
       htHeadlinesRepository: headlinesRepository,
+      htCategoriesRepository: categoriesRepository,
+      htCountriesRepository: countriesRepository,
+      htSourcesRepository: sourcesRepository,
       kvStorageService: kvStorage,
     ),
   );