Initial commit: FieldLogger MAUI app with Maglink BLE support

Added Maglink RTK GNSS receiver integration with correct BLE UUIDs and device name filtering (ML-* prefix).

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

FieldLogger/Views/DeviceScanPage.xaml.cs

@@ -0,0 +1,26 @@
+using FieldLogger.ViewModels;
+
+namespace FieldLogger.Views;
+
+public partial class DeviceScanPage : ContentPage
+{
+    private readonly DeviceScanViewModel _viewModel;
+
+    public DeviceScanPage(DeviceScanViewModel viewModel)
+    {
+        InitializeComponent();
+        BindingContext = _viewModel = viewModel;
+    }
+
+    protected override async void OnAppearing()
+    {
+        base.OnAppearing();
+        await _viewModel.ScanAsync();
+    }
+
+    protected override void OnDisappearing()
+    {
+        _viewModel.StopScan();
+        base.OnDisappearing();
+    }
+}