fix: VLM识别修复 - 去System Message + 低温 + 精简提示词

health_app/lib/pages/diet/diet_capture_page.dart

@@ -73,7 +73,9 @@ class DietNotifier extends Notifier<DietState> {
     state = state.copyWith(isAnalyzing: true, errorMessage: null);
     try {
       final api = ref.read(apiClientProvider);
-      final imageFile = File(state.imagePath!);
+      final path = state.imagePath!;
+      debugPrint('[DietDebug] analyzeImage using: $path');
+      final imageFile = File(path);
 
       final formData = FormData.fromMap({
         'images': await MultipartFile.fromFile(