✨ Setup data

lib/controllers/food_data.dart

@@ -0,0 +1,46 @@
+import 'package:dietary_guard/models/food_data.dart';
+import 'package:dio/dio.dart';
+import 'package:flutter/material.dart';
+import 'package:get/get.dart';
+import 'package:shared_preferences/shared_preferences.dart';
+
+class FoodDataController extends GetxController {
+  RxBool isReady = false.obs;
+
+  late final SharedPreferences _prefs;
+
+  Future<void> initialize(BuildContext context) async {
+    if (isReady.value) return;
+
+    _prefs = await SharedPreferences.getInstance();
+
+    isReady.value = true;
+  }
+
+  String? getApiKey() {
+    return _prefs.getString("data_fdc_api_key");
+  }
+
+  Future<void> setApiKey(String value) async {
+    await _prefs.setString("data_fdc_api_key", value);
+  }
+
+  Future<FoodDataQueryResponse> searchFood(String probe) async {
+    final client = Dio();
+    final resp = await client.get(
+      'https://api.nal.usda.gov/fdc/v1/foods/search',
+      queryParameters: {
+        'query': probe,
+        'dataType': 'Foundation',
+        'pageSize': 25,
+        'pageNumber': 1,
+        'sortBy': 'dataType.keyword',
+        'sortOrder': 'asc',
+        'api_key': getApiKey(),
+      },
+    );
+
+    final result = FoodDataQueryResponse.fromJson(resp.data);
+    return result;
+  }
+}