leerform recipe subsystem created

Plugins/LindtLeerformPlugin/Services/CalibrationDataStore.cs

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+using System.Text.Json;
+using System.Text.Json.Serialization;
+using LindtLeerformPlugin.Models;
+
+namespace LindtLeerformPlugin.Services;
+
+public static class CalibrationDataStore
+{
+    private static readonly string FilePath = Path.Combine("..", "Data", "Config", "calibration.json");
+
+    private static readonly JsonSerializerOptions JsonOptions = new()
+    {
+        PropertyNameCaseInsensitive = true,
+        WriteIndented = true,
+        Converters = { new JsonStringEnumConverter() }
+    };
+
+    public static CalibrationData? Load()
+    {
+        if (!File.Exists(FilePath))
+            return null;
+
+        var json = File.ReadAllText(FilePath);
+        return JsonSerializer.Deserialize<CalibrationData>(json, JsonOptions);
+    }
+
+    public static void Save(CalibrationData data)
+    {
+        var directory = Path.GetDirectoryName(FilePath);
+        if (directory != null)
+            Directory.CreateDirectory(directory);
+
+        var json = JsonSerializer.Serialize(data, JsonOptions);
+        File.WriteAllText(FilePath, json);
+    }
+}