Add AI API request, AI API response and AI message model

scribe/lib/scribe/ai/data/model/ai_api_request.dart

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+import 'ai_message.dart';
+
+class AIAPIRequest {
+  final List<AIMessage> messages;
+
+  const AIAPIRequest({
+    required this.messages,
+  });
+
+  Map<String, dynamic> toJson() {
+    return {
+      'model': 'gpt-oss-120b',
+      'messages': messages.map((m) => m.toJson()).toList(),
+    };
+  }
+}

scribe/lib/scribe/ai/data/model/ai_api_response.dart

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+class AIApiResponse {
+  final String content;
+
+  const AIApiResponse({
+    required this.content
+  });
+
+  static AIApiResponse? parse(Map<String, dynamic> json) {
+    final choices = json['choices'] as List<dynamic>?;
+    if (choices == null || choices.isEmpty) {
+      return null;
+    }
+
+    final firstChoice = choices[0] as Map<String, dynamic>?;
+    if (firstChoice == null) {
+      return null;
+    }
+
+    final message = firstChoice['message'] as Map<String, dynamic>?;
+    if (message == null) {
+      return null;
+    }
+
+    final content = message['content'] as String?;
+    if (content == null || content.isEmpty) {
+      return null;
+    }
+
+    return AIApiResponse(content: content);
+  }
+}

scribe/lib/scribe/ai/data/model/ai_message.dart

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+class AIMessage {
+  final String role;
+  final String content;
+
+  const AIMessage({
+    required this.role,
+    required this.content,
+  });
+
+  Map<String, dynamic> toJson() {
+    return {
+      'role': role,
+      'content': content,
+    };
+  }
+}

scribe/lib/scribe/ai/domain/model/ai_response.dart

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+class AIResponse {
+  final String result;
+
+  const AIResponse({required this.result});
+
+  factory AIResponse.fromJson(Map<String, dynamic> json) {
+    return AIResponse(
+      result: json['result'] as String? ?? json['text'] as String? ?? '',
+    );
+  }
+
+  Map<String, dynamic> toJson() {
+    return {
+      'result': result,
+    };
+  }
+}