refactor bang sources

app/lib/features/bangs/data/models/bang.dart

@@ -8,9 +8,19 @@ import 'package:json_annotation/json_annotation.dart';
 part 'bang.g.dart';
 
 enum BangGroup {
-  general,
-  assistant,
-  kagi,
+  general(
+    'https://raw.githubusercontent.com/kagisearch/bangs/main/data/bangs.json',
+  ),
+  assistant(
+    'https://raw.githubusercontent.com/kagisearch/bangs/main/data/assistant_bangs.json',
+  ),
+  kagi(
+    'https://raw.githubusercontent.com/kagisearch/bangs/main/data/kagi_bangs.json',
+  );
+
+  final String url;
+
+  const BangGroup(this.url);
 }
 
 enum BangFormat {

app/lib/features/bangs/domain/repositories/sync.dart

@@ -87,27 +87,21 @@ class BangSyncRepository extends _$BangSyncRepository {
   Future<Result<void>> syncGeneralBangs({Duration? syncInterval}) =>
       _syncBangGroup(
         BangGroup.general,
-        Uri.parse(
-          'https://raw.githubusercontent.com/kagisearch/bangs/main/data/bangs.json',
-        ),
+        Uri.parse(BangGroup.general.url),
         syncInterval,
       );
 
   Future<Result<void>> syncKagiBangs({Duration? syncInterval}) =>
       _syncBangGroup(
         BangGroup.kagi,
-        Uri.parse(
-          'https://raw.githubusercontent.com/kagisearch/bangs/main/data/kagi_bangs.json',
-        ),
+        Uri.parse(BangGroup.kagi.url),
         syncInterval,
       );
 
   Future<Result<void>> syncAssistantBangs({Duration? syncInterval}) =>
       _syncBangGroup(
         BangGroup.assistant,
-        Uri.parse(
-          'https://raw.githubusercontent.com/kagisearch/bangs/main/data/assistant_bangs.json',
-        ),
+        Uri.parse(BangGroup.assistant.url),
         syncInterval,
       );