feat(scanner): add native artifact pipeline

Add native IK-style capture processing, Artifact Inventory, explicit promotion and single-result review. Confirm the three live OCR corrections in the eval corpus and preserve extraction/value separation.

native/input-helper/NativeScannerFiles.cs

@@ -0,0 +1,24 @@
+using System.Text.Json;
+
+namespace GenshinAssistant.InputHelper;
+
+internal static class NativeScannerFiles
+{
+    private static readonly JsonSerializerOptions PrettyJson = new(JsonSerializerDefaults.Web)
+    {
+        WriteIndented = true,
+    };
+
+    private static readonly JsonSerializerOptions LineJson = new(JsonSerializerDefaults.Web);
+
+    public static void WriteJson(string path, object payload)
+    {
+        File.WriteAllText(path, JsonSerializer.Serialize(payload, PrettyJson));
+    }
+
+    public static void AppendJsonLine(StreamWriter writer, object payload)
+    {
+        writer.WriteLine(JsonSerializer.Serialize(payload, LineJson));
+        writer.Flush();
+    }
+}