refactor(country): inject CountryQueryService via provider

- Remove direct dependency on AppDependencies for CountryQueryService
- Inject CountryQueryService using Dart Frog provider
- Update country data operation to use injected service for complex queries
- Add CountryQueryService to middleware providers

Author: fulleni

lib/src/registry/data_operation_registry.dart

@@ -1,8 +1,8 @@
 import 'package:core/core.dart';
 import 'package:dart_frog/dart_frog.dart';
 import 'package:data_repository/data_repository.dart';
-import 'package:flutter_news_app_api_server_full_source_code/src/config/app_dependencies.dart';
 import 'package:flutter_news_app_api_server_full_source_code/src/middlewares/ownership_check_middleware.dart';
+import 'package:flutter_news_app_api_server_full_source_code/src/services/country_query_service.dart';
 import 'package:flutter_news_app_api_server_full_source_code/src/services/dashboard_summary_service.dart';
 
 // --- Typedefs for Data Operations ---
@@ -130,25 +130,25 @@ class DataOperationRegistry {
         pagination: p,
       ),
       'country': (c, uid, f, s, p) async {
-        final countryQueryService =
-            AppDependencies.instance.countryQueryService;
-        // Check for special filters that require aggregation
+        // Check for special filters that require aggregation.
         if (f != null &&
             (f.containsKey('hasActiveSources') ||
                 f.containsKey('hasActiveHeadlines'))) {
+          // Use the injected CountryQueryService for complex queries.
+          final countryQueryService = c.read<CountryQueryService>();
           return countryQueryService.getFilteredCountries(
             filter: f,
             pagination: p,
             sort: s,
           );
         }
-        // Fallback to standard readAll if no special filters are present
+        // Fallback to standard readAll if no special filters are present.
         return c.read<DataRepository<Country>>().readAll(
-          userId: uid,
-          filter: f,
-          sort: s,
-          pagination: p,
-        );
+              userId: uid,
+              filter: f,
+              sort: s,
+              pagination: p,
+            );
       },
       'language': (c, uid, f, s, p) => c
           .read<DataRepository<Language>>()

routes/_middleware.dart

@@ -10,6 +10,7 @@ import 'package:flutter_news_app_api_server_full_source_code/src/registry/data_o
 import 'package:flutter_news_app_api_server_full_source_code/src/registry/model_registry.dart';
 import 'package:flutter_news_app_api_server_full_source_code/src/services/auth_service.dart';
 import 'package:flutter_news_app_api_server_full_source_code/src/services/auth_token_service.dart';
+import 'package:flutter_news_app_api_server_full_source_code/src/services/country_query_service.dart';
 import 'package:flutter_news_app_api_server_full_source_code/src/services/dashboard_summary_service.dart';
 import 'package:flutter_news_app_api_server_full_source_code/src/services/rate_limit_service.dart';
 import 'package:flutter_news_app_api_server_full_source_code/src/services/token_blacklist_service.dart';
@@ -151,6 +152,11 @@ Handler middleware(Handler handler) {
                 ),
               )
               .use(provider<RateLimitService>((_) => deps.rateLimitService))
+              .use(
+                provider<CountryQueryService>(
+                  (_) => deps.countryQueryService,
+                ),
+              )
               .call(context);
         };
       });