feat(import): implement recipe import functionality with file and URL support

Co-authored-by: Copilot <copilot@github.com>

flutter/lib/features/import/domain/quick_import_result.dart

@@ -0,0 +1,19 @@
+/// Result from `POST /api/quick-import`.
+class QuickImportResult {
+  final String markdown;
+  final String source; // 'ica' | 'pdf' | 'image' | 'other'
+  final String? imageUrl;
+
+  const QuickImportResult({
+    required this.markdown,
+    required this.source,
+    this.imageUrl,
+  });
+
+  factory QuickImportResult.fromJson(Map<String, dynamic> json) =>
+      QuickImportResult(
+        markdown: json['markdown'] as String? ?? '',
+        source: json['source'] as String? ?? 'other',
+        imageUrl: json['imageUrl'] as String?,
+      );
+}