feat: Remove .env file for AI Scribe

It was used at the beginning for configuration purpose but now we
have the JMAP capability, no need anymore.

scribe/lib/scribe.dart

@@ -8,4 +8,3 @@ export 'scribe/ai/presentation/model/ai_action.dart';
 export 'scribe/ai/presentation/model/ai_scribe_menu_action.dart';
 export 'scribe/ai/data/repository/ai_repository_impl.dart';
 export 'scribe/ai/data/datasource/ai_datasource.dart';
-export 'scribe/ai/data/config/ai_config.dart';

scribe/lib/scribe/ai/data/config/ai_config.dart

@@ -1,7 +0,0 @@
-import 'package:flutter_dotenv/flutter_dotenv.dart';
-
-class AIConfig {
-  const AIConfig._();
-
-  static bool get isAiEnabled => dotenv.get('AI_ENABLED', fallback: 'false') == 'true';
-}

scribe/lib/scribe/ai/l10n/intl_messages.arb

@@ -1,5 +1,5 @@
 {
-  "@@last_modified": "2025-12-10T10:22:36.990738",
+  "@@last_modified": "2025-12-15T14:32:54.358333",
   "categoryCorrectGrammar": "Correct grammar",
   "@categoryCorrectGrammar": {
     "type": "text",